OBD Guide

P1600

ECM BATT Malfunction

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–333 (est.)

Symptoms

  • The engine stalls or runs erratically
  • Difficulty starting the engine
  • Check Engine Light Is On
  • Loss of engine power
  • Malfunctions of the car's electronic systems

Causes

  • Low or faulty battery
  • Problems with the generator
  • Damage to the wiring harness to the ECU
  • Oxidation or poor contact in ECU connectors
  • Malfunction of the engine control unit itself

How to Fix

  1. Check battery and generator voltage
  2. Inspect the connectors and wiring to the ECU for damage
  3. Check and clean the contacts of the ECU connectors
  4. Check the fuses associated with the ECU power supply
  5. If necessary, replace the ECU

Related codes

Error P1600 by Vehicle Brand