Carlexica

P0340: Camshaft Position Sensor A Circuit Bank 1 or Single Sensor

A generic powertrain (engine and transmission) trouble code, same meaning on every brand.

Fix now, drive carefully

Same caution as P0335 - stall and no-start risk make this a prompt repair.

$80 - $400
typical repair range
74
NHTSA complaints mention this code
96,000
median mileage when reported, mi

Symptoms

  • Hard starting or no-start
  • Stalling, rough running in fallback mode

Likely causes, most common first

  1. Camshaft position sensor failure
  2. Wiring or connector issues
  3. Timing chain stretch moving the cam signal (with P0016)

Read P0340 yourself before paying for diagnosis

A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.

What is going on and how it gets diagnosed

P0340 covers the camshaft position sensor circuit, which tells the computer which cylinder is on which stroke. Many engines can limp on the crank signal alone once running, but starting becomes unreliable.

If P0340 arrives together with correlation codes like P0016, suspect the timing chain rather than the sensor - the sensor may be accurately reporting a cam that really has moved. Alone, it is usually just an aging sensor, a modest fix.

Repair options and cost

Cam position sensor$120 - $400
Wiring repair$80 - $250

Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.

Owner reports mentioning P0340

“I was driving my 2019 GMC and all of a sudden I pulled into a subdivision the vehicle shut off and would not start again. I wasn't given an y warning or heard any sounds it shut off and would not start up again. I checked the battery and it was fine. I had it towed to a mechanic shop. They replaced the starter, and the battery module. after that they ran codes and the codes were P00C6 and P0340. I had it towed the the local chevrolet dealership and they told me I needed to have the engine replaced, however they don't have any engines available or know when they would be able to get one.”2019 GMC Sierra 1500 · May 2026
“.2016 F-150 Ford Truck. Purchased from a used car dealership. While driving the truck on a freeway at about 40 MPH, accelerated to 55 MPH and changed lanes. Engine went into limp mode. Check engine light flashed. Started to deaccelerate. Moved vehicle over to shoulder. Fault codes: P0340, P0344, P0365, P0369. This truck has a 2.7L EcoBoost engine. Mileage is about 130,000. Two mechanics from different companies evaluated and found timing chain broke and sheared the keyway on the crank shaft where the timing sprocket is located. There was not prior warning to indicate any issues.”2016 Ford F-150 · Mar 2026
“Vehicle was taken to dealership feb 2026 for turbo/wastegate repair (p0299). March 22, 2026, vehicle stalled and screen said to shift to neutral and push to start again. Car would crank but not start (sounds like there is no compression). Had vehichle towed two miles to residence and connected to obdii scanner, which showed 6 new codes (p0006, p228c, p0089, p0340, p0365, p0299).”2021 Chevrolet Trailblazer · Feb 2026
Show 7 more owner reports
“I have three check engine codes P0340 Camshaft Position Sensor A Circuit (Bank 1 or single sensor) P0341 Camshaft Position Sensor A Circuit Range/Performance (Bank 1 or single sensor) P0016 Crankshaft Position - Camshaft Position Correlation - Bank 1 Sensor A The last one is the same code that's involved in the L 87 recall that my vehicle is three months shy of I have a 2021 Silverado trail bus 6.2 L that was manufactured in December 2020 I have very rough idol delayed throttle response in multiple camshaft codes that correlate with the crankshaft symptoms of the L 87 recall”2021 Chevrolet Silverado 1500 · Nov 2025
“The concern is a rear end collision. At road speeds, vehicle changed to neutral (popped out of gear). Engine continued to run. Vehicle had to cost to a safe spot. At stop the vehicle was turned completely off and restarted with no issue. This is a repeatable but intermittent issue. This issue has also occurred at stop signs and slow speeds. The engine check light and ABS Light did come on. The following stored codes were present: P0340, P1DD2 and U1424. The following pending codes were present: P1DD2, U017E-70, P0340-30, U1424, U0415. Camshaft Position Sensor was changed; but didn't fix the issue.”2015 Ram 1500 · Jun 2025
“As I was driving home 8/2/24 at approximately 12:00pm the engine died in my 2020 Ford EcoSport. The automobile will not start, resulting in my having to get it towed. Powertrain Malfunction/ Reduced Power. P0012 A Camshaft position timing over - Retarded Bank 1 P0014 B Camshaft position Timing Over - Advanced or System Performance Bank 1 P0299Turbocharge/Supercharger Underboost P0340 Camshaft Position Sensor A Circuit Bank 1 or Single Sensor”2020 Ford Ecosport · Aug 2024
“The 2021 Honda Civic experienced an emission system failure at 70,000 MPH and detected fault code p0340, possibly an injector failure”2021 Honda Civic · May 2024
“Through a check engine light for camshaft position sensor bank 1 so I replaced both of them well that cleared the check engine light for a min and was running good the after five min of running it started rough idling cutting off and throwing a check engine light for p0340 again I sent it to the Nissan dealer shop they said it didn't have no check light they tested the sensors and said there good and don't know what it could be”2011 Nissan Pathfinder · Feb 2024
“Car will either not start or heists to start code with check engine light is P0340 for camshaft position sensor I have already replaced this once before 2yrs ago it should not need to be replaced again so soon. I have read online where others with same make and model cars having similar issues and their cars stalled while driving mine hasn't as of yet, but could when I take to mechanic shop. This is a major safety problem. There has been a recall but not for my year model car and needs to be fixed for more cars are having similar issues and is a major concern. Please look more in to this thank you.”2016 Nissan Altima · Dec 2023
“The ETC warning light came on, then the car slowed down then stalled out and would not crank back up. Upon running a diagnostic, the following error codes displayed; P0420, P0340, P0197, P0117, P1D83, P2181(several codes showing up more than once showing permanent, pending). This also happened before but was taken to the dealership to be repaired but the problem is back again but worse. Me and my family were on the highway at the time of this happening and when this happened previously, I begged Carvana to take this car back as it not safe and it has happened again.”2017 Dodge Journey · Dec 2022

Cars that report P0340 most often

Based on mentions of this code in NHTSA owner complaints.

2003 Nissan Murano5 mentions in complaints2003 Nissan Maxima5 mentions in complaints2003 Infiniti G354 mentions in complaints2003 Nissan 350Z4 mentions in complaints2003 Nissan Altima2 mentions in complaints2006 Nissan Altima2 mentions in complaints2018 Ford Ecosport2 mentions in complaints2003 Infiniti I352 mentions in complaints2018 Chrysler 3001 mentions in complaints2004 Infiniti I351 mentions in complaints2004 Nissan Quest1 mentions in complaints2015 Kia Sorento1 mentions in complaints

Frequently asked questions

Can I drive with P0340?

Same caution as P0335 - stall and no-start risk make this a prompt repair.

How much does it cost to fix P0340?

Typical US repair costs range from $80 for the simplest fix (cam position sensor) to $400 in the worst case. The right number depends on which cause your car has - see the causes list.

Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.