B1557

DTC B1557: VSS Signal Failure

DTC Detecting Condition and Trouble Area






DTC Troubleshooting



1.
Was "Air Conditioning System Check" performed?
YES
Go to Step 2.
NO
Go to Air Conditioning System Check:Auto A/C.

2. DTC check

Connect scan tool to DLC with ignition switch turned OFF.
Check DTC in ECM.

Is DTC P0500 detected?
YES
Go to applicable DTC diag. flow.
NO
Substitute a known-good HVAC control module and a known-good BCM individually and recheck.