Error code P1693 is displayed and the check engine light is on - what does this mean?
The DTC P1693 is a manufacturer-specific error code that mainly occurs in Chrysler, Dodge and Jeep vehicles and indicates a problem in the engine control module (PCM) or in the communication between different control units. The OBD system detects faults in the internal electronics or in data transmission between the modules. In some vehicle models, this code can also indicate problems with the automatic transmission control module.
What causes can this error code have?
- Defective engine control module (PCM)
- Damaged wiring between the control modules
- Corroded or loose plug connections
- Voltage problems in the vehicle electrics
- Defective transmission control module (TCM)
- Software error in the control unit
- Malfunctions due to electromagnetic interference
- Damaged CAN bus cables
- Defective earth points in the vehicle
Which symptoms occur in parallel with fault code P1693?
- Check engine light: Permanently lit or flashing warning light in the dashboard
- Shifting problems: Irregular shifting behavior with automatic transmissions
- Engine performance: Reduced engine performance or jerky engine running
- Starting problems: Difficulty starting or longer starting times
- Electronics failure: Failure of various electrical systems
- Emergency running program: Vehicle switches to emergency running mode
- Communication error: Diagnostic device cannot communicate with all modules
How can the problem with error code P1693 be rectified?
- Troubleshooting trouble code P1693 requires a systematic approach, as it is a complex electronic fault.
- Carry out a control unit reset: Disconnect the vehicle battery for 15 minutes, allow all capacitors to discharge and then reconnect to reset the PCM
- Check wiring and plug connections: Check all cable connections between PCM and other control units for damage, corrosion or loose contacts and clean or replace if necessary
- Check power supply: Check battery voltage and charging system, replace defective battery or alternator, clean and tighten all ground points
- Carry out a software update: Have a specialist dealer install the latest firmware for the engine control unit to rectify known software errors
- Replace control unit: Replace defective PCM or TCM with a new or overhauled control unit and then have it programmed
- Diagnose the CAN bus system: Use professional diagnostic equipment to test communication between all control units and repair damaged bus lines
FAQ - Frequently asked questions about DTC P1693
Can I continue driving with fault code P1693?
Continuing to drive with fault code P1693 is only recommended to a limited extent. As this is a communication error between important control units, further damage may occur or the vehicle may switch to emergency mode.
How much does it cost to repair fault code P1693?
Depending on the cause, the repair costs vary from €150 for simple cable repairs to €1,500 for replacing the engine control unit. A professional diagnosis costs around €100-150.
Can the error code P1693 disappear by itself?
The eobd code P1693 can disappear temporarily after a battery change or reset, but usually returns if the root cause has not been rectified. Permanent disappearance without repair is unlikely.
What tools do I need to diagnose error code P1693?
For a basic diagnosis, you will need an OBD scanner, a multimeter and basic tools. For a complete diagnosis, however, a professional diagnostic device with manufacturer access is required.
Is fault code P1693 a common problem?
DTC P1693 mainly occurs in older Chrysler vehicles and is a known problem. Vehicles with higher mileage or after improper electrical interventions are particularly affected.
Can I repair fault code P1693 myself?
You can carry out simple measures such as checking the plug connections or a reset yourself. However, in the case of control unit problems or software errors, a specialist workshop is required.
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