P2607
Intake Air Heater B Circuit Low
Cold-start / intake air heating
Generic OBD-II
Low
What it means
P2607 means the control module detected low voltage (usually a short to ground) in the "B" circuit for the intake air heater — the element that warms incoming air to help the engine start and run smoothly when cold. It's an electrical fault in a cold-start aid, so the engine itself runs fine; the main effect is harder starting in cold weather until the wiring or heater is repaired.
Low
Can I keep driving? Fine to drive — the engine runs normally; you may only notice rougher or slower cold starts in very cold weather until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Harder or slower starting in cold weather
- Possible brief rough running right after a cold start
- Often no noticeable symptom in warm conditions
Common causes
Most likely first
- Short to ground or low voltage in the intake air heater 'B' control circuitLikely
- Corroded, loose, or damaged connector at the heater element or relayCommon
- Failed intake air heater element or its relayCommon
- Chafed or broken wiring between the control module and the heaterLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the intake air heater connector and wiring for corrosion, chafing, or a short to ground.
- Check the heater relay and its control circuit for correct operation.
- Measure the heater element's resistance and supply voltage; replace the element if it's open or shorted.
- Repair any damaged wiring, clear the code, and confirm it doesn't return on the next cold start.
FAQ
Quick answers
Is it safe to drive with P2607?+
Yes. The intake air heater only assists cold starts, so the engine runs normally otherwise. You may just get harder starts on cold mornings.
Can I just clear P2607?+
You can, but if the circuit is shorted or the heater has failed the code will come back. Repair the wiring or heater to clear it for good.
Related codes
Often seen with P2607
Read & clear P2607 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX