P0645 - OBD Trouble Code
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OBD Code P0645 - A/C Clutch Relay Control Circuit
P0645 is a diagnostic trouble code (DTC) for
"A/C Clutch Relay Control Circuit". This code indicates that a fault
has been detected in the A/C clutch relay control circuit. The PCM or one of
the other supporting control modules has detected this fault. Due to this code
the A/C of your vehicle may not function properly or may not work at all and
check engine light will illuminate.
Learn More About OBD Error Code P0645
The P0645 OBD-II trouble code is associated with
the air conditioning (A/C) clutch relay control circuit. This is a generic
diagnostic trouble code (DTC) and applies to many OBD-II vehicles. The purpose
of the A/C clutch relay control circuit is to control the operation of the air
conditioning. This is accomplished by providing power to the A/C clutch to
engage the A/C compressor. This code can be identified by the PCM or other
supporting modules and this code will be detecting when there are improper
signals within the A/C clutch relay control electrical circuit.
In the event of an a/c clutch relay control
circuit fault, a trouble code will be stored and a service engine soon lamp
will be illuminated.
What causes this problem with the A/C Clutch Relay Control Circuit?
- Faulty A/C Clutch
- Inoperative A/C Clutch relay
- Defective control module ground
strap
- Flawed or faulty wiring
- Blown fuses
- Fallacious connector
- Inoperative A/C
Replace/Repair These Parts To Fix OBD Code P0645
- A/C Clutch Relay - The air conditioning clutch relay transfers power, like a
switch, from the interior A/C controls of an automobile to the A/C compressor,
engaging the compressor clutch. Replace or repair it if you discover it faulty.
- A/C Compressor - The compressor is the power unit of the air-conditioning
system that puts the refrigerant under high pressure before it pumps it into
the condenser, where it changes from a gas to a liquid. It should be inspected
thoroughly and repaired as required.
- A/C Clutch - The A/C Clutch is an electromagnetic device that engages and
disengages the AC compressor pulley from the compressor drive. The AC
compressor is a pump that is driven by the engine crankshaft through a belt
pulley. However, the compressor needs to run only when the air conditioner is
turned on. Check out the A/C Clutch thoroughly and if you find it faulty
replace it.
Symptoms Of OBD Error Code P0645
The symptoms of this code are might
not noticeable except flashing of check engine light, apart from this other
symptom may include:
- A/C functioning badly
- A/C may not work at all
How To Correct P0645 A/C Clutch Relay Control Circuit
The main problem you will face due
to this code is inconvenience without A/C. If you prefer to drive in comfort,
and you’re A/C isn’t working properly then you needed to fix this code on
priority. However, people who can manage without A/C can fix this code as per
their convenience. As this code is not serious but keeping a trouble code for a
long is not a good idea. Following repairs or replacements may help you to fix
this code:
- Replacing the A/C clutch relay
- Replacing blown fuse or fuse-able
link (if applicable)
- Cleaning corrosion from connectors
- Evacuate and recharge A/C system
- Repairing or replacing wiring
- Repairing or replacing ground straps
- Replacing a control module
- Replacing the A/C clutch
- Replacing the A/C Compressor
- Flashing or replacing PCM
All that you require to fix this
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Easy Diagnosis Of Engine Error OBD Code P0645
Here are some steps which you should
follow in order to diagnose this fault code:
- Visually inspect to check the associated wiring
for obvious defects such as scraping, rubbing, bare wires, or burn spots.
- Check the connectors and connections for
security, corrosion and damaged pins.
- All wiring connectors and connections to
components including control modules and ground straps should be checked
thoroughly and repair or replace as necessary.
- Re-test the system to determine if the repairs
have been effective.
- Clear out the codes and see if they return when
the vehicle is operating.
- Test drives the vehicle.
Common Mistakes When Diagnosing the P0645 Code
Symptoms and stored codes that are
present as a reaction to a communication failure are often misdiagnosed and
repaired as the cause of the problem. Obviously, this leads to an unsuccessful
repair.