What Does P1436 Mean?
The PCM has detected an electrical malfunction in the secondary air injection pump relay circuit that doesn't fit the specific criteria for open, short to power, or short to ground. This is a general electrical fault indicator for the relay control system.
Common Causes
30%
Intermittent connection at relay socket or connectors
25%
High resistance in relay control circuit wiring
20%
Failed or weak secondary air pump relay
15%
Poor ground connection at relay or PCM
10%
PCM relay driver circuit malfunction
Diagnostic Steps
1
Step 1: Perform visual inspection of relay, socket, and all connectors for loose fit or corrosion
2
Step 2: Test relay operation by swapping with identical relay from another system
3
Step 3: Check voltage drop across relay control circuit while commanding relay on with scan tool
4
Step 4: Verify proper ground at relay by measuring voltage drop between relay ground and battery negative
5
Step 5: Monitor relay operation with scan tool data stream while tapping on relay and connectors to identify intermittent fault
Estimated Repair Cost
$90 - $500
Parts + labor, varies by vehicle and location
The PCM has detected an electrical malfunction in the secondary air injection pump relay circuit that doesn't fit the specific criteria for open, short to power, or short to ground. This is a general electrical fault indicator for the relay control system.
The most common cause of P1436 (Secondary Air Injection Pump Relay Circuit Electrical Malfunction) is: Intermittent connection at relay socket or connectors
Typical repair costs for P1436 range from $90 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to operate. Secondary air system may operate erratically, potentially affecting cold start emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1436 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Manufacturer
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