DTC B1420 Hummer
Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage (Bank 2)
Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage (Bank 2)
Description
The ECM detects greater than 10 crankshaft revolutions. The engine speed is less than 2,520 RPM. The DTCs run continuously once the above condition is met. The CMP sensor signal voltage is always high and the ECM detects no pulses from the CMP sensor for greater than 1 second or cumulative of 10 seconds.
Cause and Solution
Low reference circuit for an open high resistance or for a short to voltage 5 volt reference circuit for an open high resistance Short to voltage in the signal circuit Short to ground or an open high resistance in the signal circuit. CMP has failed ECM has failed
Video Guide
Diagnostic Info
- DTC Code: B1420
- Brand: Hummer