🚨 Diagnostic Profile
Vehicle/Equipment Make: BUICK
Technical Description: Fuel Solenoid Response Time Too Short
This diagnostic trouble code indicates that the fuel injector solenoid is closing or opening faster than the Powertrain Control Module (PCM) expects based on programmed calibration values. This condition typically points to an electrical response issue within the fuel injector driver circuit, a degraded solenoid winding, or a PCM calibration mismatch rather than a purely mechanical fuel delivery problem.
🚨 Repair Difficulty Tier
Classification: Intermediate
This repair requires the use of a bi-directional scan tool capable of reading live injector response data (pulse width and response time in milliseconds) along with a digital multimeter or lab scope to test injector driver circuit integrity. While not as high-liability as airbag or brake system work, it does require intermediate-level knowledge of electrical waveform interpretation and PCM-controlled circuits, placing it above basic DIY skill level.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the engine wiring harness, specifically the connectors leading to the fuel injector solenoids. Look for:
- Corroded, bent, or loose injector harness pins
- Chafed or melted wiring insulation near the exhaust manifold or valve covers
- Signs of oil or fuel contamination at the injector electrical connector
- Aftermarket or non-OEM injectors that may not match PCM calibration specs
Confirm battery voltage and grounds at the PCM are within specification, as low voltage can sometimes cause irregular solenoid response timing readings.
Step 2: Diagnostic Verification
Connect a scan tool capable of accessing enhanced GM data streams and monitor the following live parameters:
- Injector response time (ms) for each cylinder individually
- Short-term and long-term fuel trims for signs of lean or rich compensation
- Injector on-time/pulse width correlation to engine load
If response time remains abnormally short across all cylinders, suspect a PCM calibration or software issue. If isolated to one or two cylinders, use a lab scope or multimeter in diode-check mode to test the injector solenoid coil resistance (typically 11-16 ohms for most GM applications) and inspect the injector driver circuit for a shorted or degraded transistor output.
Step 3: Resolution & Reset Process
Based on diagnostic findings:
- If an individual injector solenoid tests out of resistance specification, replace the faulty fuel injector(s) with OEM or OEM-equivalent parts.
- If the wiring harness shows damage, repair or replace the affected harness section using proper gauge wire and weatherproof connectors.
- If no component fault is found, reprogram or flash the PCM with the latest manufacturer calibration using a factory-level scan tool (such as GM Tech2/MDI2 with GDS2 software) to correct injector response timing parameters.
- After repairs, clear the DTC, perform a battery relearn/idle relearn procedure, and conduct a test drive while monitoring live injector response data to confirm the fault does not return.
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- OEM fuel injector(s) (if solenoid fault confirmed)
- Wiring harness repair kit/connectors (if damage found)
- GM factory scan tool with GDS2/Tech2Win software for PCM reflash (if calibration update required)
Average Component Price: $45–$120 per fuel injector (OEM); $150–$300 for dealer-level PCM reprogramming/software service; $20–$60 for harness repair components.
Estimated Labor Hours: 1.5–3.0 hours for full diagnostic, circuit testing, and injector replacement; add 0.5–1.0 hour if PCM reprogramming is required.