DTC C12E4 Chevrolet
O2 (B1 S1) Heater Circuit
O2 (B1 S1) Heater Circuit
Description
ECT Sensor less than 147ºF, BTS signal within 27ºF of ECT Sensor, system voltage over 10.5v, running at idle for 12 seconds, and the PCM detected the O2 signal was more than 3.0v for 30-90 seconds.
Cause and Solution
ASD relay output (power) circuit to the heater is openO2 heater ground circuit is open or has high resistanceO2 heater element is damaged or it has failedPCM has failed
Video Guide
Diagnostic Info
- DTC Code: C12E4
- Brand: Chevrolet