P0204 on GMC: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0204 specifically affecting GMC vehicles (Sierra 1500, Yukon, Acadia, Canyon, Terrain).
Select Your GMC Model for P0204:
1. Common Symptoms on GMC Vehicles
When GMC Engine Control Modules (ECM) trigger fault code P0204, drivers typically report:
2. Root Causes on GMC Engines
Historical diagnostic claims across GMC engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for GMC
Measure resistance across pins (12–16 ohms). on GMC engines.
Check that ECM pulse reaches the connector. on GMC engines.
Replace the faulty injector with OEM unit. on GMC engines.
Clear DTC memory and confirm smooth operation. on GMC engines.
Equipment for Diagnosing GMC (P0204)
GMC OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for GMC.
AstroAI Auto-Ranging Digital Multimeter
Essential for testing 0.1V–5.0V sensor reference signals, ground continuity (<0.20Ω), and harness resistance.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
4. GMC P0204 Frequently Asked Questions
What does code P0204 mean on a GMC?
On GMC vehicles, P0204 indicates that the Engine Control Module (ECM) detected injector circuit malfunction - cylinder 4. This typically points to Faulty Cylinder 4 fuel injector or Broken wiring harness.
Can I continue driving my GMC with code P0204?
No. Cylinder 4 is disabled, causing rough running and unburned fuel delivery issues. Because this code carries a Critical severity rating on GMC powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0204 on a GMC?
Estimated DIY parts cost ranges from $150 - $550 (DIY: $40 - $180), while professional shop repairs at an authorized GMC dealership or independent specialist typically range from $180 to $380 including diagnostic labor.