P0337: How to Diagnose & Fix — Crankshaft Position Sensor "A" Circuit Low Input
2 vehicles · 2 makes · $100-$500 repair
How to diagnose and fix P0337: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Pontiac Bonneville · 1992–2005
Failing crankshaft position sensors and ignition control modules are among the most common causes of intermittent stalling and no-spark no-start conditions on 3800-powered Bonnevilles, documented by RepairPal as a known model problem. The CKP sensor's hall-effect elements degrade with heat, causing the engine to randomly die while driving — often with no trouble code — and frequently restart only after cooling down. The ICM, which needs both 18X and 3X/sync crank signals to fire the coils, exhibits the same heat-related intermittent failure.
Common Symptoms
- Engine stalls randomly while driving
- Restarts only after sitting and cooling down
- Cranks but no start with no spark
- Tachometer drops to zero before a stall
- Check engine light may or may not illuminate
How to Fix
Test the crank sensor and ICM circuits and replace the failed component; the dual CKP sensor sits behind the harmonic balancer, so the crank pulley must be pulled, and a crank relearn may be required after replacement. Many high-mileage owners replace the CKP sensor and ICM together to end repeat intermittent stalls.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- GM 10456161 / ACDelco 213-151 crankshaft position sensor
Excludes 1992 and 2004-2005 GXP 4.6L; confirm VIN and relearn requirements.
- GM 19245558 / current 19435469 ignition control module
Excludes the 4.6L GXP; confirm VIN and current supersession before ordering.
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Sources for this issue (5)
- AA1Car — Diagnosing the Buick (GM) 3800 V6 Engine: CKP sensor and ignition module no-startarticle
- EasyAutoDiagnostics — How to Test the GM 3.8L Ignition Control Module and Crank Sensor (applies to Pontiac Bonneville 1993-2005)article
- RepairPal — Engine Performance Problems Due to Crankshaft Position Sensor Failure: Pontiac Bonnevillearticle
- RepairPal — Engine Stalling Due to Mass Air Flow/Crankshaft Position Sensor Failure: Pontiac Bonneville (149 reports)article
- Edmunds Forums — Pontiac Bonneville Starting/Stalling/Ignition Problems (multi-page thread)forum
Saab 9-5 · 1999–2009
The crankshaft position sensor on the first-generation 9-5 (B235 engine) is a very common failure item. As it degrades it tends to fail when the engine is hot, producing the classic 'hot no-start': the engine cranks but will not fire when warm, then restarts after cooling. It can also cause intermittent stalling while driving, a real safety concern.
Common Symptoms
- Hot no-start (cranks but won't start when warm)
- Intermittent stalling
- Restarts after cooling down
- Check engine light
How to Fix
Replace the crankshaft position sensor with an OEM/Bosch-quality part - cheap unbranded aftermarket sensors are reported to fail again within months. The sensor is relatively inexpensive but located awkwardly near the bell-housing.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Bosch OE-supplier crank position sensor 32101510 / Saab 55557326
Saab 9-5 1998-2009 B205/B235 four-cylinder and cataloged OG 9-3 applications; confirm VIN/engine. Not B308 V6 or later engines.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
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P0337 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 P0337 mean?
P0337 stands for "Crankshaft Position Sensor "A" Circuit Low Input." The crankshaft position (CKP) sensor watches a toothed reluctor wheel on the crankshaft and tells the engine computer exactly how fast the crank is spinning and where each piston is, which the computer needs to time spark and fuel injection. P0337 sets when the computer sees the sensor's signal voltage stuck near zero — below the expected range — usually because the sensor has failed or its wiring is open, shorted to ground, or corroded. You may notice hard starting, an engine that cranks but won't start, rough idle, stalling, or reduced power and fuel economy; on many vehicles the engine simply won't run while the fault is present. Ignoring it risks being stranded by a sudden no-start or a stall in traffic, so it should be diagnosed promptly.
What are the most common causes of P0337?
The most common causes of P0337 are: Failed crankshaft position sensor (the most common cause), Open, shorted-to-ground, or chafed wiring in the CKP sensor circuit, Loose, corroded, or damaged CKP sensor connector, Damaged, dirty, or missing-tooth reluctor (tone) ring on the crankshaft, Metal debris on the sensor's magnetic tip or incorrect sensor air gap, Low battery voltage or a weak starter producing an out-of-range signal during cranking, Faulty powertrain control module (rare). The specific cause varies by vehicle.
How much does it cost to fix P0337?
Repair costs for P0337 range from $100 to $500, depending on the vehicle and root cause.
Which vehicles are affected by P0337?
Au7o has documented P0337 across 2 vehicle models from 2 manufacturers: Pontiac, Saab.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.