P0337 on Saab
Crankshaft Position Sensor "A" Circuit Low Input
P0337 on Saab vehicles indicates crankshaft position sensor "a" circuit low input. Au7o has documented this code across 1 Saab model — most commonly on 9-5. 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. Typical repair costs on Saab range from $100 to $350, depending on the specific model and root cause.
Common Causes of P0337
- •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)
P0337 on Saab by Model
Saab 9-5(1 issue)
- Crankshaft Position Sensor (CPS) Hot No-Start1999-2009
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.
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View P0337 across all makes →Frequently Asked Questions
What does P0337 mean on Saab?▼
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. On Saab specifically, this code is documented across 1 model.
What causes P0337 on Saab vehicles?▼
Common causes on Saab: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0337 on a Saab?▼
Repair costs on Saab range from $100 to $350, depending on the specific model and root cause.
Which Saab models have P0337 documented?▼
Au7o has documented P0337 on 1 Saab model: 9-5.