# Service bulletin 21\-016\-25 REV. C

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11022007
- Published by NHTSA: 2025\-08\-21
- Manufacturer's number: 21\-016\-25 REV. C
- Manufacturer's date: 2025\-08\-15
- NHTSA component: POWER TRAIN

## NHTSA's summary

Valve Body Replacement Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● U0101 \- Lost Communication With The Transmission Control Module \(TCM\). ● U0402 \- Implausible Data Received From TCM. ● U0418 \- Implausible Data Received From Brake System Control Module 1. Customers may also comment on the following: ● Vehicle will go in limp\-in mode. After the vehicle enters limp\-in mode and has been shifted into Park, the vehicle will not shift into a forward or reverse gear This bulletin involves replacing the transmission valve body assembly.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11022007-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11022007-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Trouble codes named

U0101, U0402, U0418

## Vehicles listed

- 2023 to 2025 JEEP GRAND CHEROKEE
- 2023 to 2025 JEEP GRAND CHEROKEE 4XE
- 2023 to 2025 JEEP GRAND CHEROKEE L
- 2023 to 2025 JEEP GRAND WAGONEER
- 2023 to 2025 JEEP WAGONEER
- 2025 RAM 1500

## Recalls for the same vehicles and component

- [26V413000](/recalls/nhtsa/26V413000.md), 2026-06-30: POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION \(PRNDL\)
- [2025450](/recalls/tc/2025450.md), 2025-09-04: Powertrain

## Other bulletins for the same vehicles and component

- [S2621000004](/bulletins/11038329.md), 2026-10-07, Service bulletin: POWER TRAIN. The Customer May Complain About a Popping Noise, Grinding Noise, or an Intermittent No Reverse or Forward Transmission Engagement. The Tech May Find Damaged and/or Worn Transmission Output Shaft Splines \(850RE Transmission Only\)
- [18\-071\-26 REV. A](/bulletins/11038312.md), 2026-10-07, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*P2237\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1. ● P2240\-00 \- O2 Sensor Positive Current Control Circuit/Open Bank 2 Sensor 1. ● P2251\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1. ● P2254\-00 \- O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1. ● P2243\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1. ● P2247\-00 \- O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 1. ● P015B\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 1 Sensor 1. ● P015D\-00 \- O2 Sensor Delayed Response \- Lean To Rich Bank 2 Sensor 1. ● P0E7C\-00 \- Coolant Bypass Valve "B" Control Circuit Low. ● P0E7D\-00 \- Coolant Bypass Valve "B" Control Circuit High. ● P0E7E\-00 \- Coolant Bypass Valve "B" Control Circuit Range/Performance. ● P0E7F\-00 \- Coolant Bypass Valve "B" Control Circuit Stuck/Open. ● U063C\-00 \- Lost Communication With Coolant Bypass Valve Actuator "B". ● P0100\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit. ● P0101\-00 \- Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance. ● P0461\-00 \- Fuel Level Sensor "A" Circuit Range/performance. ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low. ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance. ● B1810\-00 \- Driver Door Shorted Low. ● B25C7\-00 \- Redundant Driver Door Shorted Low.\*\* ● U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.
- [S2418000012 REV.C](/bulletins/11037155.md), 2026-09-08, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. Mil On/Check Engine Lamp \(CEL\) On, Engine Runs Rough
- [18\-077\-26](/bulletins/11036359.md), 2026-08-26, Service bulletin: POWER TRAIN; ENGINE. Flash: Powertrain Control Module \(PCM\) Updates Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle may SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ● P0300 \- Multiple Cylinder Misfire. Customers may experience one of the following: ● Vehicle runs rough on initial cold start only after an overnight or extended soak. \*\*This bulletin involves reprogramming the PCM with the latest available software.\*\*
- [18\-071\-26](/bulletins/11035321.md), 2026-07-29, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/Stuck Off. ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High. ● P0071\-00 \- Ambient Air Temperature Sensor Performance. ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected. ● P1CEA\-00 \- Boost Side EVAP Purge System Performance. ● P05BD\-00 \- Stop\-start Mode Switch Range/Performance. ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking. ● U0673\-00 \- Lost Communication With Ion Sense Module. ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \- in ACTIVE or STORED status. ● P0325\-00 \- Knock/Combustion Vibration Sensor 1 Circuit \- in ACTIVE or STORED status. ● P0330\-00 \- Knock/Combustion Vibration Sensor 2 Circuit \- in ACTIVE or STORED status. ● P032A\-00 \- Knock\-Combustion Vibration Sensor C Circuit \- in ACTIVE or STORED status. ● P018B\-00 \- Fuel Pressure Sensor "B" Circuit Range/Performance \- in ACTIVE or STORED status. ● P2AF6\-00 \- Starter Relay 3 Stuck Off \- in ACTIVE or STORED status. ● P0300\-00 \- Multiple Cylinder Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. ● P0301\-00 \- Cylinder 1 Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. ● P0302\-00 \- Cylinder 2 Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. ● P0303\-00 \- Cylinder 3 Misfire \- in ACTIVE or STORED status set during cold start catalyst heating. This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [18\-070\-26](/bulletins/11035320.md), 2026-07-29, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P2AF6\-00 \- Dual Starter Relay Stuck \(in active or stored status\). ● P1CEA \- Boost Side EVAP Purge System Performance \(in active or stored status\). ● P2C90\-00 \- Crankcase Ventilation System \- Hose "A" Disconnected \(in active or stored status\). ● P0111\-00 \- Intake Air Temperature Sensor 1 Circuit Range Performance Bank 1 \(in active or stored status\). ● P0071\-00 \- Ambient Air Temperature Sensor Performance \(in active or stored status\). ● P0325\-00 \- Knock/Combustion Vibration Sensor 1 Circuit \(in active or stored status\). ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low \(in active or stored status\). ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High \(in active or stored status\). ● P0011\-00 \- Bank 1 Camshaft 1 Position Timing Over Advanced Or \(in active or stored status\). ● P25E4\-00 \- B Camshaft Position \- Unable To Achieve Locked Position Bank 1 \(in active or stored status\). ● U0673\-00 \- Lost Communication With Ion Sense Module \(in active or stored status\). ● P05BD\-00 \- Stop\-Start Mode Switch Range/Performance \(in active or stored status\). ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/stuck Off \(in active or stored status\). ● P0116\-00 \- Engine Coolant Temperature Sensor 1 Performance \(in active or stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(in active or stored status\). ● P0330\-00 \- Knock/Combustion Vibration Sensor 2 Circuit \(in active or stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [18\-069\-26](/bulletins/11035319.md), 2026-07-29, Service bulletin: POWER TRAIN. Flash: Powertrain Control Module \(PCM\) Updates Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes \(DTCs\): ● \*\*U0104\-00 \- Lost Communication With Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). ● U0405\-00 \- Invalid Data Received From Cruise Control Module \(NA Market Only\) \(In Active or Stored status\). NOTE: Vehicles setting DTCs U0405\-00 and U0104\-00 may experience an inability to be cleared.\*\* ● P0111\-00 \- Intake Air Temperature Sensor 1 Circuit Range Performance Bank 1 \(In Active or Stored status\). ● P0071\-00 \- Ambient Air Temperature Sensor Performance \(In Active or Stored status\). ● P0072\-00 \- Ambient Air Temperature Sensor Circuit "A" Low \(In Active or Stored status\). ● P0073\-00 \- Ambient Air Temperature Sensor Circuit "A" High \(In Active or Stored status\). ● P0011\-00 \- Bank 1 Camshaft 1 Position Timing Over Advanced Or \(In Active or Stored status\). ● P25E4\-00 \- B Camshaft Position \- Unable To Achieve Locked Position Bank 1 \(In Active or Stored status\). ● U0673\-00 \- Lost Communication With Ion Sense Module \(In Active or Stored status\). ● P05BD\-00 \- Stop\-Start Mode Switch Range/Performance \(In Active or Stored status\). ● P06DD\-00 \- Engine Oil Pressure Control Circuit Performance/stuck Off \(In Active or Stored status\). ● P0116\-00 \- Engine Coolant Temperature Sensor 1 Performance \(In Active or Stored status\). ● P00C6\-00 \- Fuel Rail Pressure Too Low \- Engine Cranking \(In Active or Stored status\). ● P0325\-00 \- Knock/Combustion Vibration Sensor 1 Circuit \(In Active or Stored status\). ● P0330\-00 \- Knock/Combustion Vibration Sensor 2 Circuit \(In Active or Stored status\). ● P032A\-00 \- Knock \- Combustion Vibration Sensor C Circuit \(In Active or Stored status\). ● P062B\-00 \- Internal Control Module Fuel Injector Control Performance \(In Active or Stored status\). This bulletin involves inspecting and possibly reprogramming the PCM with the latest available software.
- [113528](/bulletins/11035187.md), 2026-07-23, Service bulletin: POWER TRAIN. SHAFT \- AXLE HALF
- [113529](/bulletins/11035186.md), 2026-07-23, Service bulletin: POWER TRAIN. SHAFT \- AXLE HALF
- [21\-041\-26 REV. A](/bulletins/11034324.md), 2026-07-02, Service bulletin: POWER TRAIN. Transmission Auxiliary Oil Pump Failure Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set \*\*one or more the following Diagnostic Troubles Code \(DTCs\): ● U0287\-00 \- Lost Communication With Transmission Fluid Pump Module 1.\*\* ● P0B0D\-00 \- Electric/Auxiliary Transmission Fluid Pump Motor Control Module. Customers may also comment on the following: ● Vehicle is in limp mode. This bulletin involves replacing the transmission oil pump.

JSON: [/v1/bulletins/11022007](/v1/bulletins/11022007)

[Report an error on this page](https://github.com/wenmar-pro/wenmar-open/issues/new?template=data_correction.yml&title=Data%20correction%3A%20Service%20bulletin%2021-016-25%20REV.%20C&page=https%3A%2F%2Fopen.wenmarpro.com%2Fbulletins%2F11022007&vehicle=Service%20bulletin%2021-016-25%20REV.%20C)