What Does P2607 Mean?
The PCM has detected abnormally low voltage in the intake air heater B control circuit. This indicates a short to ground, excessive current draw, or circuit resistance issue.
Common Causes
30%
Short to ground in intake air heater B wiring harness
28%
Failed intake air heater B with internal short circuit
20%
Corroded or damaged connector causing short at heater B
15%
Faulty intake air heater B relay stuck closed or shorted
7%
PCM driver circuit failure for heater B control
Diagnostic Steps
1
Step 1: Disconnect intake air heater B and check for short to ground in wiring (measure resistance to ground, should be open)
2
Step 2: Inspect wiring harness for damage, chafing, or wire insulation breakdown near hot engine components
3
Step 3: Measure resistance of heater B element; if abnormally low (near zero), heater is shorted internally
4
Step 4: Check intake air heater B relay operation and test for internal short
5
Step 5: If all components test good, verify PCM control circuit is not shorted internally
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the intake air heater B control circuit. This indicates a short to ground, excessive current draw, or circuit resistance issue.
The most common cause of P2607 (Intake Air Heater "B" Circuit Low) is: Short to ground in intake air heater B wiring harness
Typical repair costs for P2607 range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause blown fuses or excessive current draw. Vehicle is safe to drive but cold starting will be compromised in freezing conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2607 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake Air Heating System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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