# Service bulletin 18237

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: 10145172
- Published by NHTSA: 2018\-10\-09
- Manufacturer's number: 18237
- Manufacturer's date: 2018\-08\-09
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; POWER TRAIN

## NHTSA's summary

18237 \- Emission Recall \- TCM Software Potential Emissions Noncompliance. \- General Motors has decided to conduct a voluntary emissions recall involving certain 2017\-2018 model year vehicles equipped with an 8\-speed transmission \(RPO MRC\) that were service programmed with incorrect transmission control module, \(TCM\) software. Vehicles programmed with this software may, under certain downhill driving conditions, remain stuck in gear or shift up later than expected, after RPMs \(Revolutions Per Minute\) are already high. This condition can only be cleared by an ignition key cycle \(turning the vehicle off and then back on again\) or by shifting the vehicle into and out of Neutral. Dealers are to reprogram the TCM.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10145172-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10145172-0001.pdf)

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

## Components

Engine, Exhaust and emissions, Transmission and driveline

## Vehicles listed

- 2017 to 2018 CADILLAC XT5

## Other bulletins for the same vehicles and component

- [00\-06\-01\-026R](/bulletins/11026017.md), 2025-12-03, Service bulletin: ENGINE. This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
- [23\-NA\-153](/bulletins/11024485.md), 2025-10-25, Service bulletin: ENGINE. The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
- [15\-NA\-010](/bulletins/11020254.md), 2025-07-07, Service bulletin: ENGINE. This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in other states.
- [PI0281L](/bulletins/11019516.md), 2025-06-12, Service bulletin: STEERING; POWER TRAIN; SUSPENSION. This preliminary informational \(PI\) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
- [25\-NA\-100](/bulletins/11019503.md), 2025-06-12, Service bulletin: ENGINE. This warranty administration bulletin provides policy information on vehicles outside of a California Emissions State who move to and register their vehicle in a California Emission State may be entitled to the 7 year, 70,000\-mile Emission Select State Component Limited Warranty.
- [21\-NA\-139](/bulletins/11017443.md), 2025-05-01, Service bulletin: ELECTRICAL SYSTEM; ENGINE. This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp \(MIL\) Illuminated \- DTC P3055 Set.
- [25\-NA\-052](/bulletins/11017263.md), 2025-04-28, Service bulletin: ENGINE. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
- [25\-NA\-052](/bulletins/11016942.md), 2025-04-10, Service bulletin: ENGINE. This bulletin advises the technician to flush the cooling system multiple times if oil has been found in the cooling system and replace the parts that may be contaminated due to oil in system.
- [22\-NA\-074](/bulletins/11014233.md), 2025-02-12, Service bulletin: ENGINE. This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
- [21\-NA\-043](/bulletins/11014230.md), 2025-02-12, Service bulletin: VISIBILITY/WIPER; SERVICE BRAKES; ENGINE; ELECTRICAL SYSTEM; WHEELS. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold \(prepping\) to the customer.

JSON: [/v1/bulletins/10145172](/v1/bulletins/10145172)

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