DTC Advanced Diagnostics: P1701
DTC P1701:Back-Up Light Switch Malfunction

General Description

The powertrain control module (PCM) monitors the back-up light switch for rationality faults. The back-up light switch signal is used to detect whether the vehicle is running in reverse. If the back-up light switch is stayed ON for a certain distance, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
0.5 second or more
DTC Type
Two drive cycles, MIL off

Enable Conditions
Condition
Minimum
Maximum
12 volt battery voltage [Battery]
10.5 V
–
Vehicle
ON mode
[ ]: HDS Parameter

Malfunction Threshold
The back-up light switch stayed ON for at least 100 milliseconds while the vehicle is driven for 2 miles (2 km) or more.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Back-up light switch BACK LT line short to power
Back-up light switch stuck on
PCM internal circuit failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.