C1102 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

C1102 Code failures by brands

C1102 CHEVROLET: BATTERY VOLTAGE TOO LOW.

Description of DTC code C1102

The Hydraulic Electronic Control Unit (HECU) has circuits to perform well. One of these circuits monitors the voltage level available to the HECU, taking into account that, if the voltage level is not necessary, the system cannot guarantee a complete operation.

When the operation of the Anti-lock Braking System (ABS) is required, there are several current requirements that will affect the battery voltage, causing it to drop considerably. Because of this, the voltage is monitored before and during ABS operation to verify that the charging system is in good condition for proper ABS performance.

When the C1102 OBDII diagnostic code is set on your Chevrolet vehicle, it is because the battery voltage is less than 10.5 volts before ABS operation begins. On certain models, this code is also set if the ignition voltage is less than 10.5 volts and the battery voltage is less than 9.0 volts during ABS operation.

Symptoms of fault code C1102

  • Check Engine light on.
  • Light warning of Anti-Lock Brake System
  • ABS disabled.
  • No voltages to solenoids or pump motor.
  • Traction problems.

Causes of OBD2 C1102

The reasons that lead to the DTC C1102 OBD2 code setting on your Chevrolet are:

  • The battery may not have enough charge.
  • A battery terminal may have a faulty contact.
  • The ground connection to the battery on the block or chassis could be faulty.
  • The HECU could have damage to a contact on its terminal or ground connection.
  • The charging system could be malfunctioning due to damage to the generator/alternator.

Possible solutions of the DTC code C1102

The steps to troubleshoot the C1102 OBDII fault code on your Chevrolet are:

  • Consult the Technical Service Bulletins.
  • Check that the battery has a sufficient charge level. Consult the vehicle's information source to know this value, which, in general, should be between 4 ~ 17 V, and if you discover inconsistencies, verify that it is not due to damages in the connections.
  • Thoroughly inspect all wiring and connectors that are related to the ABS and Electronic Hydraulic Control Unit. If any of these electronic components show common damage, make repairs or replacements.
  • Perform voltage tests between the HECU If these voltages are not as specified by the manufacturer, make repairs as required.
  • Checks alternator for proper alternator performance following manufacturer's recommended diagnostic steps. Correct it as required, including consideration of alternator replacement.

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