What Does P2142 Mean?
The powertrain control module (PCM) has detected an abnormally high voltage signal in the EGR throttle control circuit. This indicates the control circuit voltage exceeds the expected operating range, suggesting a short to power or faulty actuator.
Common Causes
35%
Shorted wiring or connector pins to battery voltage in EGR throttle control circuit
30%
Failed EGR throttle position sensor or internal actuator short
20%
Faulty EGR valve assembly with internal electrical fault
10%
PCM internal driver circuit failure
5%
Damaged or corroded connectors causing voltage irregularities
Diagnostic Steps
1
Step 1: Inspect EGR throttle actuator connector for damage, corrosion, or signs of water intrusion
2
Step 2: Disconnect EGR throttle actuator and measure voltage at harness connector with key on; should be within 4.5-5.5V reference voltage
3
Step 3: Check for short to power in control circuit wiring by measuring resistance to battery positive
4
Step 4: Test EGR throttle actuator position sensor signal using scan tool live data during commanded movement
5
Step 5: If all circuits test normal, substitute known-good EGR valve or test PCM driver circuit output
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected an abnormally high voltage signal in the EGR throttle control circuit. This indicates the control circuit voltage exceeds the expected operating range, suggesting a short to power or faulty actuator.
The most common cause of P2142 (Exhaust Gas Recirculation Throttle Control Circuit "A" High) is: Shorted wiring or connector pins to battery voltage in EGR throttle control circuit
Typical repair costs for P2142 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced fuel economy and increased emissions. Extended operation may cause catalyst damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2142 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control (EGR System)
Difficulty
Type
Generic (SAE)
Recommended Tools
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