This guide is customized for your 2020 Chevrolet SILVERADO 1500 PICKUP
P0678: P0678: Engine Control Module (ECM) Output Circuit Malfunction
on 2020 Chevrolet SILVERADO 1500 PICKUP
Important for 2020 Chevrolet SILVERADO 1500 PICKUP Owners
Before starting repairs, verify which engine your 2020 Chevrolet SILVERADO 1500 PICKUP has. Check your VIN or engine code to ensure you order the correct parts.
📖 What Does P0678 Mean on 2020 Chevrolet SILVERADO 1500 PICKUP?
Symptoms
- • Engine misfires
- • rough engine idle
- • decreased engine performance
- • reduced fuel efficiency
Common Causes
- • Faulty ECM output circuit
- • damaged or corroded wiring
- • faulty engine sensors
- • ECM software issue
How to Fix P0678 on 2020 Chevrolet SILVERADO 1500 PICKUP
1. Check and clean the ECM output circuit wiring and connectors. 2. Replace the faulty ECM output circuit. 3. Check and replace any faulty engine sensors. 4. Update the ECM software if necessary.
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Read & clear codes on your 2020 Chevrolet SILVERADO 1500 PICKUP
Shop Scanners ↗Related Diagnostic Codes
Other codes that may appear with P0678
P0676: Engine Control Module (ECM) Output Circuit Malfunction
P0677: Computer Output Circuit Malfunction
P0679: Engine Control Module (ECM) Output Circuit Malfunction
P0680: Engine Control Module (ECM) Output Circuit Malfunction
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system