P0340 on Volvo: How to Diagnose & Fix
Camshaft Position Sensor Circuit Malfunction
2 Volvo models · 2 documented issues · 1 critical · $50-$3,000 repair
P0340 on Volvo by model: symptoms, diagnosis and fix
The distributor cap and rotor on the 850 5-cylinder develop carbon tracking and contact wear, causing misfires and hard starting. The distributor seal also leaks oil into the cap.
Common Symptoms
- Misfire
- Hard starting in damp weather
- Rough idle
- Loss of power
How to Fix
Remove the distributor cap and inspect for carbon tracking, burned terminals, moisture, and any oil contamination; if oil is present inside the cap, replace the distributor shaft seal/O-ring at the same time or the new ignition parts will fail again. Replace the cap and rotor with quality OEM or Bosch parts, clean the mating surfaces, inspect the plug wires for corrosion or high resistance, and verify base ignition performance by checking for a smooth idle and no misfire under load after installation. The distributor is driven off the end of the intake camshaft, and leakage from the camshaft seal behind it is common and should be addressed during service; a clogged PCV/crankcase vent system can push oil past the cam seals, so check it too. Typical parts cost is about $40-$120 for the cap and rotor and $10-$25 for the seal, with total repair cost usually running $150-$350 at an independent shop.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Bosch 03371 / 1235522408 distributor cap
replace a carbon-tracked, cracked, oil-damaged or terminal-worn distributor cap Fitment/availability: Distributor-equipped Volvo 850 five-cylinder applications; confirm VIN, engine and installed distributor before purchase Fitment/availa…
- Bosch 04272 / Volvo 1367783 distributor rotor
replace a burned, cracked or worn rotor with the diagnosed cap-and-rotor service Fitment/availability: Distributor-equipped 1993-1997 Volvo 850 applications shown in IPD fitment; confirm engine and installed distributor Fitment/availabil…
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Sources for this issue (3)
The Volvo V40 with the 1.9T engine (a Volvo modular engine) is an interference engine requiring strict timing belt maintenance. Belt failure causes catastrophic valve and piston damage. The belt and tensioner must be replaced together.
Common Symptoms
- Belt squealing
- Oil leak at the timing cover that can soak the belt
- Engine will not start if belt has snapped
How to Fix
Replace the timing belt together with the tensioner and idler (commonly the water pump at the same time) at the scheduled interval; a commonly listed interval for the 2000-2004 V40 1.9 L turbo is about 60,000 miles, and age, heat and an oil-soaked belt justify earlier replacement. Check your owner's manual or a Volvo dealer for the exact interval for your car. If the belt has already snapped, do not keep cranking the engine; have a compression or leak-down test done to assess valve damage before deciding on repair.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- IPD 120612 V40 1.9T timing-belt and water-pump kit
complete belt, tensioner, idler and water-pump service on the verified 1.9T branch Fitment/availability: 2000-2004 Volvo V40 1.9T with B4204T2, B4204T3 or B4204T4 engine; confirm engine code and service interval Fitment/availability: In …
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Sources for this issue (2)
P0340 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 P0340 mean on a Volvo?
P0340 stands for "Camshaft Position Sensor Circuit Malfunction." This code means the engine computer lost or received an erratic signal from the camshaft position sensor. That sensor tells the computer the exact position and speed of the camshaft, which it uses together with the crankshaft sensor to time fuel injection and spark precisely. When the camshaft signal is missing, intermittent, or out of range, the computer sets P0340. Symptoms often include hard starting, stalling, rough running, or a no-start because the engine can't time itself correctly. On Volvo it is documented across 2 models: 850, V40.
What are the most common causes of P0340?
The most common causes of P0340 are: Failed camshaft position sensor, Corroded or loose sensor connector, Damaged or shorted sensor wiring, Bad reluctor/tone ring on the camshaft, Loose timing chain/belt or jumped timing, Metal debris or oil contamination on the sensor tip, Poor sensor power or ground supply, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0340 on a Volvo?
Published repair estimates on Volvo range from $50 to $3,000 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.