P26C8Chassis Control Module 1 Requested MIL Illumination
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26C8 is not a fault of the engine module itself. It is stored when a unit outside the powertrain, which the manufacturer designates chassis control module 1, has logged an emission-related code of its own and asks the engine module over the network to light the check engine lamp. GM lists it in the engine tables 18OBDG04 and in the hybrid tables 18OBDG01: the request message is watched continuously from three seconds after power-up, and the code is Type A but carries no lamp request of its own. GM preliminary information PIT6010 (Buick LaCrosse, Cadillac XT5 2017–2019) mentions P26C8 together with U135A after a transmission range control module was replaced and its software did not match. The real cause is found in the memory of chassis module 1, which has to be read first.
- What you may notice
- Check engine lamp on
- Service transmission or chassis warning message
- Additional codes stored in the chassis module
- Likely causes
- LikelyEmission-related fault stored in chassis control module 1
- PossibleReplaced module with mismatched or missing software configuration
- RareLow supply voltage or network disturbance during start-up
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.