OBD Guide
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P1602

Engine Control Module Supply Voltage Low From Battery

P1602 is an OBD-II diagnostic trouble code meaning: Engine Control Module Supply Voltage Low From Battery. Common causes: weak or dead battery, generator malfunction. Estimated repair cost: $6–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–167 (est.)

Symptoms

  • Unstable engine operation
  • Problems starting the engine
  • Check Engine Light Is On
  • Loss of engine power
  • Malfunctions of the car's electronic systems

Causes

  • Weak or dead battery
  • Generator malfunction
  • Damage or corrosion of wires and contacts
  • Relay or fuse problems
  • ECU malfunction

How to Fix

  1. Check battery charge and condition
  2. Check generator operation
  3. Inspect wires and contacts for damage and corrosion
  4. Check relays and fuses
  5. Diagnostics and possible replacement of the ECU

Related codes

P1601P1603P1604

Error P1602 by Vehicle Brand

BMWBuickCadillacChevroletChryslerDodgeGMGMCJeepMazdaOldsmobilePlymouthPontiacSaturnVolkswagen

FAQ

What does the P1602 code mean?

P1602 is an OBD-II diagnostic trouble code that indicates: Engine Control Module Supply Voltage Low From Battery

What causes a P1602 error code?

The most common causes of P1602 include: Weak or dead battery; Generator malfunction; Damage or corrosion of wires and contacts; Relay or fuse problems.

How do I fix a P1602 diagnostic trouble code?

To fix P1602: Check battery charge and condition. Check generator operation. Inspect wires and contacts for damage and corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1602?

Limited driving only, diagnose soon

How much does it cost to fix P1602?

The estimated repair cost for P1602 is $6–167. Actual cost depends on your vehicle, location, and labor rates.

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