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Service bulletin PI1489A

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10190567
Published by NHTSA2021-04-26
Manufacturer's numberPI1489A
Manufacturer's date2015-12-01
NHTSA componentPOWER TRAIN:MANUAL TRANSMISSION; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

NHTSA's summary

Malfunction Indicator Lamp (MIL) Illuminated, Intermittently Unable to Shift into Reverse, DTC P0502 Set Condition/Concern Some customers may comment on a malfunction indicator lamp (MIL) illuminated. They may also comment that they intermittently are unable to shift into Reverse. When checking the vehicle for DTCs, the engine control module (ECM) may report P0502 as current or in history. This may be caused by water intrusion into the vehicle’s manual transmission output speed sensor or could be induced by the customer slipping the clutch for an extended period of time, as in holding the vehicle on a hill.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Engine, Transmission and driveline, Engine control module, Manual transmission

Trouble codes named

P0502

Vehicles listed
CADILLAC ATS2013, 2014, 2015, 2016
CADILLAC ATS-V2016 (the catalog's model; the bulletin names a series or trim of it)
CHEVROLET CORVETTE2014, 2015

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
PIE0302A2024-04-15. Service bulletin. Engineering Information
PIE03022024-04-15. Service bulletin. Engineering Information
PIP5628F2023-05-15. Service bulletin. This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 - P0308 and/or P050D
183572022-05-31. Service bulletin. Special Coverage. On some vehicles, the vehicle may inadvertently shift into manual mode and, depending on the vehicle?s speed, the transmission will automatically downshift to first or second gear, resulting in a safe, but unwanted vehicle deceleration. If this occurs, the driver will not be able to shift out of manual mode until the vehicle. is turned off and back on again. The vehicle will also set diagnostic trouble codes P0816 and P1876. Dealers are to remove and replace the shifter assembly. The repairs will be made at no charge to the customer
PI1489A2021-09-07. Service bulletin. Malfunction Indicator Lamp (MIL) Illuminated, Intermittently Unable to Shift into Reverse, DTC P0502 Set
PI1276C2021-09-07. Service bulletin. Difficult to shift into Gear, Intermittent Gear Pop Out and/or Mushy shifts (no grind)
990420002L2021-08-09. Service bulletin. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.
PI1122A2021-04-28. Service bulletin. Malfunction Indicator Lamp Flashes Due to Engine Misfire On Acceleration, DTC P0300 and/or P0303 Set Condition/Concern Some customers may comment that the Malfunction Indicator Lamp flashes when accelerating from a stop or after a steady cruise. The customer may also note that the engine speed was between 2000-4400 RPM when the light illuminated. Depending on the circumstances, some customers may state that no driveability concerns were present while others may state they had considerable driveability impacts. When checking the vehicle for DTCs, the Engine Control Module (ECM) may report DTC P0300 Engine Misfire Detected and/or P0303 Cylinder 3 Misfire Detected set in history.
030729004L2019-05-20. Service bulletin. This informational bulletin provides normal operating characteristics and diagnostic information on Manual transmissions.
14-07-30-001E2018-05-21. Service bulletin. This informational bulletin provides technicians with information to assist in identifying operating characteristics of manual transmissions that repair attempts will not change.