P001D code definition
“A” Camshaft Profile Control Circuit/Open
What the P001D code means
This diagnostic trouble code is an indication that the crankshaft and camshaft signals are out of time by some measure. When this happens the Power Control Module (PCM) stores the P001D trouble code and triggers the Check Engine Light.
What causes the P001D code?
The following are causes for the P001D trouble code:
- Bad camshaft sensor
- Bad crankshaft sensor
- Damaged wires to the camshaft sensor
- Loose or broken timing chain tensioner
- Timing belt has jumped a tooth due to wear
- Time chain worn out
- A loose or missing harmonic balancer bolt
What are the symptoms of the P001D code?
If the crankshaft and camshaft signals are out of time and the P001D trouble code is present, the driver may experience the engine running poorly after starting, with a lack of power. It is also possible for the car to crank, but not run. The Check Engine Light should be on while these symptoms are present.
How does a mechanic diagnose the P001D code?
First, retrieve the trouble codes and freeze frame data stored on by the Power Control Module (PCM), using the OBD-II scanner. Inspect the wiring and connector for any breaks, shorts, or corrosion. If you have a scope, check the camshaft sensor pattern.
If the camshaft pattern is missing, you may have a bad camshaft sensor. A check of the harmonic balancer (crankshaft pulley) and camshaft gear tone rings should be done as well.
Also, check the timing belt or timing chain for wear that could be causing the chain or belt to be out of time. The timing chain/bolt tensioner should be inspected as well to make sure the timing chain/belt has the proper tension so it will not jump time.
If one or more of these components are damaged, repair as necessary. If all of these timings are in working order, the camshaft sensor will need to be replaced.
Common mistakes when diagnosing the P001D code
It is common for the camshaft sensor to be replaced before the timing chain/belt tensioner is inspected for breaks.
Another common mistake is not checking the timing chain/belt for stretching, as this will trigger the P001D code as well.
How serious is the P001D code?
The P001D trouble code could be considered serious because the car may not start, or lack power when power is necessary to maneuver out of the way of trouble. With the P001D trouble code present, the vehicle should not be driven until the necessary repairs have been completed.
What repairs can fix the P001D code?
- Replacement of the sensor
- Replacement of the timing chain/belt tensioner
- Repair of the wires going to the camshaft sensor
- Replacement of the harmonic balancer (crankshaft pulley)
- Replacement of the timing chain/belt
Additional comments for consideration regarding the P001D code
It is important not to rush the diagnosis of this code, to ensure that all components of the camshaft sensor are inspected properly. Check the harmonic balancer (crankshaft pulley) for damage and always check the connector and wiring before replacing the sensor. If you have a scope, use it to look at the patterns of the camshaft and crankshaft to help with accurate diagnosis of the camshaft sensor.
Need help with a P001D code?
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This article originally appeared on YourMechanic.com as P001D OBD-II Trouble Code: “A” Camshaft Profile Control Circuit/Open and was authored by Jamahl Walker.