P0204 on Buick: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0204 specifically affecting Buick vehicles (Enclave, Encore GX, Envision, Envista).
Select Your Buick Model for P0204:
1. Common Symptoms on Buick Vehicles
When Buick Engine Control Modules (ECM) trigger fault code P0204, drivers typically report:
2. Root Causes on Buick Engines
Historical diagnostic claims across Buick engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Buick
Measure resistance across pins (12–16 ohms). on Buick engines.
Check that ECM pulse reaches the connector. on Buick engines.
Replace the faulty injector with OEM unit. on Buick engines.
Clear DTC memory and confirm smooth operation. on Buick engines.
Equipment for Diagnosing Buick (P0204)
Buick OEM Replacement Sensor
Direct-fit replacement assembly engineered to OEM tolerances for Buick.
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. Buick P0204 Frequently Asked Questions
What does code P0204 mean on a Buick?
On Buick 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 Buick 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 Buick powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0204 on a Buick?
Estimated DIY parts cost ranges from $150 - $550 (DIY: $40 - $180), while professional shop repairs at an authorized Buick dealership or independent specialist typically range from $180 to $380 including diagnostic labor.