P0340 code on 2008 SRT w/2600 miles.

[AustinSRT]

coming into work this morning and saw a light come on and heard a chime, without looking I knew I would need to get gas soon and that that was it.

Noticed at lunch it was the motor light that was lit, did the code check and it says P0340 for the camshaft sensor circuit.

Any ideas on what would cause this? Only mod is a corsa catback.

[Bornagainultimatum]

P0340-CAMSHAFT POSITION SENSOR CIRCUIT

²

When Monitored:

During engine cranking and with the engine running. Battery voltage greater than 10 volts.

²

Set Condition:

At least 5 seconds or 2.5 engine revolutions have elapsed with crankshaft position sensor signals present but
no camshaft position sensor signal. One Trip Fault. Three good trips to turn off the MIL.

Possible Causes

(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE
(F856) 5-VOLT SUPPLY CIRCUIT OPEN
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K44) CMP SIGNAL CIRCUIT OPEN
(K44) CMP SIGNAL CIRCUIT SHORTED GROUND
(K44) CMP SIGNAL SHORTED TO (F856) 5-VOLT SUPPLY CIRCUIT
(K900) SENSOR GROUND CIRCUIT OPEN
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
PCM

[Bornagainultimatum]

P0340
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Diagnostic Test

1.

ACTIVE DTC

Crank the engine.
Ignition on, engine not running.
With a scan tool read the DTCs.

Is the DTC active at this time?
Yes

>> Go To 2

No

>> Go To 14

2.

(F856) 5-VOLT SUPPLY CIRCUIT

Turn the ignition off.
Disconnect the CMP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit in the CMP
Sensor harness connector.

Is the voltage between 4.5 and 5.2 volts?
Yes

>> Go To 3

No

>> Go To 10

3.

(K44) CMP SIGNAL CIRCUIT

Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor
harness connector.

Is the voltage between 4.5 and 5.0 volts?
Yes

>> Go To 4

No

>> Go To 7

4.

(K900) SENSOR GROUND CIRCUIT OPEN

Turn the ignition off.
Disconnect the PCM harness connectors.

CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.

Measure the resistance of the (K900) Sensor ground circuit from the
CMP Sensor harness connector to the appropriate terminal of special
tool #8815.

Is the resistance below 5.0 ohms?
Yes

>> Go To 5

No

>> Repair the open in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST.
5. (K44) CMP SIGNAL SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT

Measure the resistance between the (K44) CMP Signal circuit and the
(F856) 5-volt Supply circuit in the CMP Sensor harness connector.

Is the resistance below 5.0 ohms?
Yes

>> Repair the short between the (K44) CMP Signal circuit and
the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Go To 6

6.

CAMSHAFT POSITION SENSOR
NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair
as necessary.
If there are no possible causes remaining, view repair.
Repair

Replace the Camshaft Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST.

7. (K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor
harness connector.

Is the voltage above 0 volts?
Yes

>> Repair the short to battery voltage in the (K44) CMP Signal
circuit.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Go To 8

8.

(K44) CMP SIGNAL CIRCUIT OPEN

Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.

Measure the resistance of the (K44) CMP Signal circuit from the CMP
Sensor harness connector to the appropriate terminal of special tool
#8815.

Is the resistance below 5.0 ohms?
Yes

>> Go To 9

No

>> Repair the open in the (K44) CMP Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST.
9. (K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K44) CMP Signal circuit
in the CMP Sensor harness connector.

Is the resistance below 100 ohms?
Yes

>> Repair the short to ground in the (K44) CMP Signal circuit
Perform the POWERTRAIN VERIFICATION TEST.
No >> Go To 10

10.

(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE

Turn the ignition off.
Disconnect the PCM harness connectors.
Ignition on, engine not running.
Measure the voltage on the (F856) 5-volt Supply circuit in the CMP
Sensor harness connector.

Is the voltage above 0 volts?
Yes

>> Repair the short to battery voltage in the (F856) 5-volt Supply
circuit.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Go To 11

11.

(F856) 5-VOLT SUPPLY CIRCUIT OPEN

Turn the ignition off.

CAUTION: Do not probe the PCM harness connectors. Probing the
PCM harness connectors will damage the PCM terminals resulting
in poor terminal to pin connection. Install Miller Special Tool #8815
to perform diagnosis.

Measure the resistance of the (F856) 5-volt Supply circuit between the
CMP Sensor harness connector to the appropriate terminal of special
tool #8815.

Is the resistance below 5.0 ohms?
Yes

>> Go To 12

No

>> Repair the open in the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST.
12. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (F856) 5-volt Supply
circuit in the CMP Sensor harness connector.

Is the resistance below 100 ohms?
Yes

>> Repair the short to ground in the (F856) 5-volt Supply circuit.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Go To 13

13.

PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.

Were there any problems found?
Yes

>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Replace and program the Powertrain Control Module per Service Information.
Perform (NGC) POWERTRAIN VERIFICATION TEST VER - 5.

14.

ERRATIC CMP SIGNAL

With a lab scope probe and the Miller special tool #6801, back probe
the (K44) CMP Signal circuit in the CMP harness connector.

WARNING: When the engine is operating, do not stand in direct
line with the fan. Do not put your hands near the pulleys, belts, or
fan. Do not wear loose clothing. Failure to follow these instructions
can result in personal injury or death.

Ignition on, engine not running.
Wiggle the related wire harness and lightly tap the Camshaft Position
Sensor.
Observe the lab scope screen.
Allow the engine to idle.

Observe the lab scope screen.

Did the CMP Sensor generate any erratic pulses?
Yes

>> Replace the Camshaft Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Go To 15

15.

ERRATIC CKP SIGNAL

Turn the ignition off.
With a lab scope probe and the Miller special tool #6801, backprobe
the (K24) CKP Signal circuit in the CKP harness connector.

WARNING: When the engine is operating, do not stand in direct
line with the fan. Do not put your hands near the pulleys, belts, or
fan. Do not wear loose clothing. Failure to follow these instructions
can result in personal injury or death.

Ignition on, engine not running.
Wiggle the related wire harness and lightly tap on the Crankshaft Position
Sensor.
Observe the lab scope screen.
Allow the engine to idle.
Observe the lab scope screen.

Did the CKP Sensor generate any erratic pulses?
Yes

>> Replace the Crankshaft Position Sensor.
Perform the POWERTRAIN VERIFICATION TEST.
No >> Test Complete.

[Doctor No]

car is brand new let the dealer handle it . good test to see how their service is

[bigkevin20]

well good luck I been getting that code for ever along with P0335. If they figure it out can you please pm and let me no.

[AustinSRT]

dropped it off at dealer yesterday afternoon, wait & see what happens.

[AustinSRT]

called and said it was ready, cleared code and cycled 3 times and couldn't make it repeat the code.

[bigkevin20]

Of course I hate that answer. Thats just like if you have a check engine light and when you go there its off so they wont work on your car.

[Doctor No]

Dealer failed the test of good service ,Just clearing code and could not dupilcate problem is such a cop out. Im sure they did not follow recomended service manual procedure(posted above) for trouble shooting.Most common intermittant electrical fault codes are loose pin connectors. If it happens again print these posts out and take them to the service manager and show him the dissatisfaction with his service and what his tech should look for. This approach is not easy as service managers dont like to be told their job , but sometimes it is the only way to really get your car fixed is to play hard ball.