OBD-II code · Powertrain (generic, extended)
P2C21 Engine Oil Temperature Sensor A/B Correlation
The signals of engine oil temperature sensors A and B do not correlate within the calibrated tolerance. One sensor drifts or installation offset between the two channels.
Is it safe to drive with P2C21?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOne sensor characteristic drifted
- PossibleHarness incorrectly swapped between channels
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Engine Oil Temp Sensor A, Engine Oil Temp Sensor B, Ecm
Related codes
- P2C1ECold Start Fuel Pressure Regulator A Performance
- P2C1FCold Start Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too Low
- P2C20Cold Start Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too High
- P2C22Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit
- P2C23Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Performance
- P2C24Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.