Battery Voltage Low During Crank
The PCM detected low battery voltage during engine cranking.
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)
When you try to start the engine, the computer sees that the battery voltage drops too low, indicating it can't provide enough power to crank the engine properly.
What the computer is actually seeing
The Powertrain Control Module (PCM) monitors the battery voltage. It expects at least 9.6 volts during starting. If it drops below that while cranking, it triggers this code.
What a healthy reading looks like
Battery voltage should be between 9.6 to 14.5 volts during cranking.
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. Check the battery voltage with a multimeter. Is it above 12.4 volts at rest? (Yes: go to step 2; No: charge or replace battery)
- 22. Attempt to crank the engine while monitoring the voltage. Does it stay above 9.6 volts? (Yes: go to step 3; No: check battery connections and wiring for corrosion or damage)
- 33. Inspect battery terminals and connections. Are they clean and tight? (Yes: go to step 4; No: clean and secure them, then retest)
- 44. Check the starter motor for proper operation. Does it engage and turn the engine? (Yes: check the alternator; No: replace or repair the starter motor)
- 55. Test the alternator output. Is it charging properly? (Yes: further diagnose other potential issues; No: replace the alternator)
Common causes
- Weak or dead battery
- Corroded battery terminals
- Faulty starter motor
- Bad wiring or connections on the battery circuit
- Alternator not charging properly
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive if the battery is weak; it could leave you stranded.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why did this code show up with starter problems?
If the starter draws too much current, it can cause voltage to drop below acceptable levels during cranking.
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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