# Service bulletin 18\-029\-21

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: 10190724
- Published by NHTSA: 2021\-04\-26
- Manufacturer's number: 18\-029\-21
- Manufacturer's date: 2021\-03\-26
- NHTSA component: SERVICE BRAKES; ELECTRICAL SYSTEM; BACK OVER PREVENTION; EXTERIOR LIGHTING; FUEL SYSTEM, GASOLINE; FUEL SYSTEM, DIESEL

## NHTSA's summary

Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) have been set: P0524 \- Low oil pressure \(during start up in cold ambient temps\). P249C\-00 \- Excessive Time To Enter Closed Loop Reductant Injection Control. P02E8\-00 \- Diesel Intake Air Flow Position Sensor Circuit Low. P20FB\-00 \-Reductant Pump 2 Control Performance. P065A\-00 \- Generator System Performance. Customers may experience the following: The cruise control and speed limited set speed doesn?t match the speedometer. It could be up to 2.5 kph \(1.5 mph\) difference. Other Software enhancements:Speedometer accuracy improvement\(s\). Cruise control updates. Battery durability improvements in hot ambient temperatures.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10190724-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10190724-9999.pdf)

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

## Components

Brakes, Driver assistance, Electrical system, Fuel system, Lighting, Backup camera

## Trouble codes named

P02E8, P0524, P065A, P20FB, P249C

## Vehicles listed

- 2021 JEEP WRANGLER

## Recalls for the same vehicles and component

- [24V676000](/recalls/nhtsa/24V676000.md), 2024-09-12: BACK OVER PREVENTION: SENSING SYSTEM: CAMERA; EXTERIOR LIGHTING:BRAKE LIGHTS
- [22V638000](/recalls/nhtsa/22V638000.md), 2022-08-25: BACK OVER PREVENTION:DISPLAY FUNCTION

## Other bulletins for the same vehicles and component

- [S248A000016](/bulletins/11011894.md), 2024-12-17, Service bulletin: BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING. Customer complaints regarding rear view camera inoperative or flickering blue radio screen display while transmission is in reverse or blank screens when selecting the rear camera view following a recent service repair involving the removal and installation of the rear spare tire carrier
- [0300224](/bulletins/10251863.md), 2024-03-18, Service bulletin: EXTERIOR LIGHTING; BACK OVER PREVENTION. Front and Rear Axle Sensor Kit \*\*Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find that the following Diagnostic Trouble Code \(DTC\) has been set: ? C1451\-11 \- Service Axle Locker System\*\* Customers may also comment on a Service Axle Locker message displayed in the Electronic Vehicle Information Center \(EVIC\) for this condition.
- [S2319000007](/bulletins/10248550.md), 2024-01-08, Service bulletin: BACK OVER PREVENTION; STEERING:CRITICAL FASTENERS; STEERING. Squeak Noise From Dash Area When Turning The Steering Wheel.
- [0806423](/bulletins/10248049.md), 2024-01-02, Service bulletin: BACK OVER PREVENTION:SOFTWARE. Radio Over The Air Updating to QR40.12 Software Version Mobile Wi\-Fi inoperative upon start up. ? Hotspot gives 9No Internet9 connection message on phone, when trying to connect to a device. This bulletin provides information regarding the latest Firmware Over The Air \(FOTA\) update and provides the service technician an overview of the steps a customer will need to take to complete the update. The radio software will be updated from QR39.7 to QR40.12. NOTE: National launch for this FOTA update is expected to begin March 10, 2023. DISCUSSION: Vehicles sold in the U.S. and Canada can now receive software updates ?over\-the\-air?. Updates to software will occur in a phased roll\-out. The software is updated through the built\-in cellular modem in the radio.
- [0804823](/bulletins/10248015.md), 2024-01-02, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN; BACK OVER PREVENTION; EXTERIOR LIGHTING. Flash: Battery Pack Control Module \(BPCM\) Diagnostic and System Updates Customers may experience a false Malfunction Indicator Lamp \(MIL\) illumination related to PHEV battery: ? P1A21\-00 \- HV Battery Contactor Control Sequence Incorrect. ? P0B3E\-00 \- Hybrid/EV Battery Voltage Sense 1 Circuit High. ? P0607\-00 \- ECU Internal Performance. ? P1E1B\-00 \- Hybrid/EV Battery Side Voltage System Isolation. ? P0AA4\-00 \- Hybrid Battery Negative Contactor Circuit Stuck Closed. ? P1C00\-00 \- Hybrid/EV Battery Voltage Sense 1 Out Of Range Low. ? P1C01\-00 \- Hybrid/EV Battery Voltage Sense 1 Out Of Range High. ? P1A9B\-00 \- Hybrid/EV Battery Temperature Sensor 1 Out Of Range High. ? P0BBD\-00 \- Hybrid Battery Pack Voltage Variation Exceeded Limit. ? P167B\-00 \- Controlled System Shutdown. ? U1885\-00 \- Battery Energy Control Module Lost Communication With HCP. ? P0EDD\-00 \- Hybrid/EV Battery Pack B Deterioration. ? U0111 \- Lost Communication With Hybrid Battery Pack Sensor Module. ? P0CA7\-00 \- Hybrid/EV Battery Discharging Current High. ? P1A0C\-00 \- Battery Energy Control Module System Voltage Low. This bulletin involves updating the BPCM with the latest available software. NOTE: Additional module flashes are required for this update to be effective, the following modules are all to be updated along with this BPCM update: ? Powertrain Control Module \(PCM\). ? Integrated Dual Charging Module \(IDCM\). ? Transmission Control Module \(TCM\). ? Battery Pack Control Module \(BPCM\). ? Hybrid Control Processor \(HCP\), Auxiliary Hybrid Control Processor \(AHCP\) also known as the Power Inverter Module \(PIM\).
- [S2025000001](/bulletins/10247967.md), 2024-01-02, Service bulletin: EXTERIOR LIGHTING; BACK OVER PREVENTION. Malfunction Indicator Lamp Illumination \(MIL\). Diagnostic Trouble Code \(DTC\) P203E ? Reductant Level Sensor 1 Circuit Intermittent\-Erratic Set.
- [9003357](/bulletins/10247905.md), 2024-01-02, Service bulletin: BACK OVER PREVENTION. ADAPTER, Engine Oil Filter \(Pentastar V6\) For all 2014MY replace the Oil Filter Adapter \(OFA\). For any other MY \(with mileage above 30,000\) review and follow instructions from STAR Online S1809000007 REV. C available on Dealer Connect. Also, consider the following: 1\) Remove OFA 2\) Replace only the oil inlet O\-ring and gaskets \(seals kit in SOL above\). 3\) Re\-install the OFA. For 2023MY and beyond use black O\-ring. For 2022MY and prior use red O\-ring. Note: When replacing OFA, it may be necessary to transfer the Oil Temp/Pressure Sensor from the old OFA to the new OFA.
- [9100134](/bulletins/10247903.md), 2024-01-02, Service bulletin: SERVICE BRAKES; FUEL SYSTEM, GASOLINE; BACK OVER PREVENTION. Engine When replacing a GMET4 long block from a 2021 JL or older, you will need to carry over the injector wiring harness from the original engine, and the Fuel pressure sensor should be replaced with part number: 68212572AB.
- [9100247](/bulletins/10247404.md), 2023-12-18, Service bulletin: BACK OVER PREVENTION; VEHICLE SPEED CONTROL. ERG Hydraulic Tensioner Before replacing any FEAD components, please check FEAD belt layout as per the engine sales code. Customer complaint may include a noise from under the hood described as a squeal, screech, squeak, chirp or belt\-related noise and/or noisy tensioner/pulley. Please refer to SOL\# S2309000007.
- [9100133](/bulletins/10239854.md), 2023-07-31, Service bulletin: BACK OVER PREVENTION. ROCKER ARM ASSY \- ROLLER ROCKER Case 1.\- Before replacing the intake or exhaust rocker arms due to an abnormal ticking noise, please check that the INTAKE Hydraulic Lash Adjusters are not "collapsed". If a collapsed INTAKE HLA is found, replace all INTAKE HLAs on the suspect cylinder head \(no need to replace rocker arms\). The noise can occur at low or high RPMs, and at low or high temperatures. There are no Diagnostic Trouble Codes \(DTC\)s present. Case 2.\- If the INTAKE camshaft or INTAKE rocker arm has excessive wear on the high lift profile \(Rocker arm: slider, Camshaft: central lobe\), replace the intake camshaft \(1\) in that cylinder head and all intake rocker arms \(6\).

JSON: [/v1/bulletins/10190724](/v1/bulletins/10190724)

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