What Does P2506 Mean?
The PCM power input signal is present but operating outside normal voltage range or showing erratic behavior. This suggests intermittent power supply issues or marginal voltage levels that don't meet strict PCM operating requirements.
Common Causes
30%
Intermittent connection at PCM connector due to corrosion or loose fit
25%
Charging system malfunction causing voltage fluctuations
20%
High resistance in PCM power supply wiring or connectors
15%
Weak battery or poor battery connections causing voltage instability
10%
Failing ignition switch with intermittent contact
Diagnostic Steps
1
Step 1: Monitor PCM supply voltage with scan tool data stream while wiggling harness and connectors
2
Step 2: Perform voltage drop test on all PCM power and ground circuits under load conditions
3
Step 3: Load test battery and verify charging system maintains stable 13.5-14.5V output
4
Step 4: Inspect PCM connector terminals for corrosion, overheating, or poor contact; repair as needed
5
Step 5: Check for aftermarket accessories or modifications drawing excessive current from PCM circuits
Estimated Repair Cost
$100 - $1,200
Parts + labor, varies by vehicle and location
The PCM power input signal is present but operating outside normal voltage range or showing erratic behavior. This suggests intermittent power supply issues or marginal voltage levels that don't meet strict PCM operating requirements.
The most common cause of P2506 (ECM/PCM Power Input Signal Range/Performance) is: Intermittent connection at PCM connector due to corrosion or loose fit
Typical repair costs for P2506 range from $100 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause intermittent stalling or poor engine performance at unpredictable times. Could result in loss of power while driving, creating hazardous conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2506 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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