P1407 Cadillac Code - Exhaust Gas Recirculation Control Circuit Shorted
Quick Answer
The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1407 Cadillac indicates Exhaust Gas Recirculation Control Circuit Shorted.
- Common causes
- Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P1407 Cadillac Description
What are the Possible Causes of the DTC P1407 Cadillac?
- Faulty Exhaust Gas Recirculation (EGR) Valve
- Exhaust Gas Recirculation Valve harness is open or shorted
- Exhaust Gas Recirculation Valve circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1407 Cadillac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1407 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1407 Cadillac Code
1. What does the OBDII code P1407 mean on a Cadillac?
P1407 indicates a problem with the Exhaust Gas Recirculation (EGR) control circuit, specifically a shorted circuit.
2. What are common symptoms of the P1407 code in a Cadillac?
Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, and the Check Engine Light turning on.
3. What causes the P1407 code to appear?
Possible causes include a short circuit in the EGR wiring, a faulty EGR valve, damaged connectors, or a malfunctioning Powertrain Control Module (PCM).
4. Can I drive my Cadillac with the P1407 code active?
Driving with this code is not recommended, as it may lead to increased emissions, poor performance, and potential engine damage over time.
5. How do I diagnose the P1407 code on a Cadillac?
Start by inspecting the EGR valve, wiring, and connectors for damage or corrosion. Use a multimeter to test for shorts in the circuit and check the PCM for proper operation.
6. What repairs are typically needed to fix the P1407 code?
Repairs may include replacing the EGR valve, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the PCM.
7. How much does it cost to fix the P1407 code on a Cadillac?
Repair costs can vary but typically range from $150 to $450, depending on whether the EGR valve or other components need replacement.
8. Can a clogged EGR valve cause the P1407 code?
No, the P1407 code specifically refers to an electrical issue in the EGR control circuit, not a mechanical blockage.
9. Will clearing the code with a scanner fix the P1407 issue?
Clearing the code will reset the Check Engine Light temporarily, but the underlying issue must be fixed to prevent the code from returning.
10. Can a bad PCM trigger the P1407 code?
Yes, a malfunctioning PCM can misinterpret or fail to properly regulate the EGR circuit, leading to the P1407 code.
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