What Does P2511 Mean?
The PCM has detected intermittent or erratic signal behavior in the power relay sense circuit. This indicates an unstable connection or component that causes the relay monitoring circuit to drop in and out.
Common Causes
35%
Loose or corroded connections at relay socket terminals
30%
Intermittent relay contact failure or internal relay degradation
20%
Damaged or chafed wiring causing intermittent short or open circuit
10%
Poor ground connection affecting relay circuit stability
5%
PCM connector moisture or corrosion causing intermittent contact
Diagnostic Steps
1
Step 1: Wiggle test all connectors and wiring in relay circuit while monitoring scan tool data
2
Step 2: Remove and inspect relay socket for burned, loose, or corroded terminals
3
Step 3: Clean all relay socket contacts and apply dielectric grease before reinstalling relay
4
Step 4: Perform voltage drop test on power and ground circuits to relay during operation
5
Step 5: Monitor live data during test drive over rough roads to replicate intermittent condition
Estimated Repair Cost
$80 - $600
Parts + labor, varies by vehicle and location
The PCM has detected intermittent or erratic signal behavior in the power relay sense circuit. This indicates an unstable connection or component that causes the relay monitoring circuit to drop in and out.
The most common cause of P2511 (ECM/PCM Power Relay Sense Circuit Intermittent) is: Loose or corroded connections at relay socket terminals
Typical repair costs for P2511 range from $80 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent loss of PCM power can cause sudden stalling in traffic. May result in unpredictable engine shutdown while driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2511 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Control Module Power Supply
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
