Transmission Control Module (TCM) Power Supply Low Voltage
The Transmission Control Module is experiencing a low voltage condition.
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 TCM requires a steady 12-volt supply for proper operation. If voltage drops below 10 volts, the TCM can’t function, affecting shift control.
What the computer is actually seeing
The TCM monitors its power supply and expects a voltage range of 10 to 14 volts. Below this range, it will trigger SPN 2375.
What a healthy reading looks like
Normal voltage should be above 10 volts and below 14 volts.
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.
- 11. Inspect the battery voltage with a multimeter. Expect it to be above 12.4 volts. If not, recharge or replace the battery.
- 22. Check the battery connections and engine ground for corrosion. Clean if necessary.
- 33. Inspect the wiring harness and connectors going to the TCM for damage or corrosion.
- 44. Measure the voltage at the TCM connector with the ignition on. Should be between 10-14 volts. If voltage is low, trace the supply wiring back to the battery or fuse.
- 55. If all connections and voltages are correct but the code persists, consider testing or replacing the TCM.
Common causes
- Weak battery or poor connections
- Damaged wiring to TCM
- Faulty TCM causing excessive power draw
- Corroded grounds affecting voltage supply
- Aftermarket accessories drawing too much power
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal, as it can lead to shifting issues, but the vehicle may still be operational.
Will this code come back after clearing?
If the underlying issue is not fixed, it's likely to reappear.
Why might it pair with transmission issues?
The TCM controls shifting; low voltage impacts its operation, causing erratic behavior.
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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