With 4L80E Automatic Transmission

DTC 52/53 System Voltage High Long / System Voltage High:

System Voltage:

CIRCUIT DESCRIPTION
Ignition voltage is supplied to the control module to indicate the ignition status of the ignition switch. Battery voltage is supplied to the control module to, in part, maintain memory of learned functions and parameters.

DTC 53 WILL SET WHEN
^ The ignition is "ON."
^ The ignition system voltage is greater than 19.5 volts.
^ All conditions met for 2 minutes.

ACTION TAKEN (PCM will default to)
^ Maximum line pressure.
^ 2nd gear.
^ Inhibit TCC.

DTC 53 WILL CLEAR WHEN
Fault condition no longer exists, and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic charts.
1. Normal battery voltage is between 9-15 volts.
2. This test checks if the generator is faulty under load conditions.

DIAGNOSTIC AIDS
^ Charging the battery and jump-starting an engine may set DTC 52/DTC 53. If DTC(s) set when an accessory is operated, check for faulty connections or excessive current draw.
^ Check for faulty connections at the starter solenoid or fusible link.