Drivetrain Control Module Power Supply Low Voltage
This code indicates low voltage detected at the drivetrain control module.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer that controls the drivetrain isn't getting enough power to work properly, which can happen if there's a problem with the wiring or the battery.
What the computer is actually seeing
The drivetrain control module expects to see a nominal voltage supply of 12V to 14V. If the voltage drops below 9V, it triggers this code.
What a healthy reading looks like
Nominal voltage range for operation is between 12V and 14V.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the vehicle battery voltage (should be above 12.4V). Deciding factor: If below, charge or replace the battery.
- 2Inspect battery terminals for corrosion or loose connections. Deciding factor: If corroded, clean or tighten terminals.
- 3Check the charging system output while the engine is running (should be 13.5V to 14.5V). Deciding factor: If not in range, replace or repair the alternator.
- 4Inspect wiring and connectors between the battery and the drivetrain control module for damage. Deciding factor: Any damage found means repair or replace wiring.
Common causes
- Weak or dead battery
- Corroded or loose battery terminals
- Faulty alternator
- Damaged wiring to the drivetrain control module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix this soon, as low voltage can cause drivability issues.
Will the code come back after clearing it?
If the underlying voltage issue isn't fixed, yes, the code will likely return.
Why did this code appear alongside another one?
Multiple low voltage codes can point to a common issue with battery or wiring.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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