P0353 on Pontiac: How to Diagnose & Fix
Ignition Coil C Primary/Secondary Circuit Malfunction
1 Pontiac model · 1 documented issue · 1 critical · $400-$1,000 repair
P0353 on Pontiac by model: symptoms, diagnosis and fix
1993-1997 Firebird/Trans Am with the LT1 5.7L V8 (same engine in Camaro Z28, Corvette C4, and some Buick Roadmaster/Caprice/Impala SS) suffers infamous Optispark distributor failure. The distributor sits at the front of the engine behind the water pump — coolant leaks from the water pump (or condensation from the front of the engine) drip directly into the Optispark and short the optical sensors. Symptoms: misfire, no-start, rough running in wet weather.
Common Symptoms
- misfire
- no-start when wet
- rough idle
- random cylinder misfire codes
How to Fix
Replace Optispark with a 1995+ vented Delco unit ($250-$500 part). ALWAYS replace the water pump at the same time ($150-$250 part) — they are the same labor job (water pump must come off to access the Optispark). Total job ~$400-$900 at independent. Confirm the vent tube routing on later "vented" Optispark.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- AIP D92LT new non-vented Optispark distributor
Do not use as a 1995-1997 vented unit.
- AIP D95LT new vented second-generation Optispark distributor
Confirm vent and vacuum-harness routing.
- ENC-1182 LT1 cam-driven aluminum water pump with gaskets
Confirm drive/seal condition and current installation procedure.
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P0353 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0353 mean on a Pontiac?
P0353 stands for "Ignition Coil C Primary/Secondary Circuit Malfunction." This is an ignition/engine code. An ignition coil converts the battery's low voltage into the high voltage needed to create a spark at the plug. P0353 means the engine computer detected a fault in the primary or secondary circuit of ignition coil 'C' — the expected feedback when the coil is commanded to fire is missing or abnormal. Typical effects are a misfire, rough idle, hesitation, or loss of power, and a prolonged misfire can overheat and damage the catalytic converter. On Pontiac it is documented across 1 model: Firebird.
What are the most common causes of P0353?
The most common causes of P0353 are: Failed ignition coil 'C', Damaged wiring or corroded connector at the coil, Open or short in the coil primary/secondary circuit, Worn or fouled spark plug adding load to the coil, Poor power or ground supply to the coil, Faulty ignition driver in the ECM (less common). The specific cause varies by vehicle.
How much does it cost to fix P0353 on a Pontiac?
Published repair estimates on Pontiac range from $400 to $1,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0353 on a different make?
View P0353 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.