2020 Cadillac CT6 warning light illuminates intermittently indicating a drop in engine power.

Posted by Tony Brown on

2020 Cadillac CT6 warning light illuminates intermittently indicating a drop in engine power.

Car: Cadillac Model: CT6 System: Engine Year model: 2020  Issue: The customer reported that recently the vehicle intermittently prompted a warning light indicating a reduction in engine power.  Fault diagnosis: Start the vehicle road test, after driving for a period of time, the engine fault light was on and the instrument prompted the fault information of engine power dropping. It was then verified that the problem described by the customer was true.  Check whether there are modified parts, etc. In this case, the vehicle did not have any modifications and program changes.  Connect the diagnostic device (GDS) to the vehicle...

Read more →

[Repair Case] 2020 Audi A6L e-tron Fan Runs Automatically

Posted by Tony Brown on

[Repair Case] 2020 Audi A6L e-tron Fan Runs Automatically

Model: C8, equipped with DPMA engine and 0CK transmission. Driving mileage: 233 miles.  Issue: The customer reported that sometimes the fan will run automatically after the remote control opens the door or stops the car. The diagnostic instrument finds that there is a fault code "P069300 cooling fan actuation 2, short-circuit to ground" in the thermal management control unit J1024.  Troubleshooting: The car is a plug-in hybrid vehicle, the temperature of the air conditioner and engine as well as the temperature of the high voltage components and the cooling fan are controlled by the thermal management control unit J1024. Referring...

Read more →

[Repair Case] 2022 Mercedes-Benz GLE350e low-voltage power system cannot be charged

Posted by Tony Brown on

[Repair Case] 2022 Mercedes-Benz GLE350e low-voltage power system cannot be charged

Brand: Mercedes-Benz Model: GLE350e System: Charging Year model: 2022 Issue: When the new car is in pre-delivery inspection (PDI), it is found that the instrument battery alarms, and the low-voltage power system cannot be charged.  Troubleshooting: This fault was discovered in the PDI of the new car, the low-voltage system could not be charged, the battery warning light is illuminated. The vehicle can be started, but it has been consuming power, up to -40A, and the high-voltage system is normal. No relevant DTCs were found in a quick test. Before diagnosing faults, we should first be familiar with the structural...

Read more →

[Repair Case] Lexus IS audio does not work.

Posted by Tony Brown on

[Repair Case] Lexus IS audio does not work.

  Model: Lexus IS sedan Driving Mileage: 74565 miles  Issue: The customer came to the store and reported that the vehicle's audio (as shown in Figure 1) would not work, and asked for inspection and maintenance.  Figure 1  Troubleshooting: We turned on the radio after starting the car and found that there was no sound from the stereo, and no response occurred when we tried to adjust the volume. However, the volume shown on the navigation did change, so we adjusted the playback mode to CD playback, but there was still no sound. We asked the customer about the car's...

Read more →

[Repair Case] Mercedes-Benz C300 steering wheel vibration

Posted by Tony Brown on

[Repair Case] Mercedes-Benz C300 steering wheel vibration

Model: C300 with 274 engine. Driving Mileage: 18,465 miles Issue: When the ignition switch is turned on, the steering wheel vibrates, and the multi-function display in the center of the instrument prompts "the lane keeping assist system has stopped working".  Troubleshooting: Connect the diagnostic instrument to perform a quick test. The steering column module N80 has a fault code: B1E9F15 steering wheel electronic device has functional failure, there is a short circuit or open circuit to the positive pole; B1EB015 lane keeping assist system has a fault, there is short circuit or open circuit to positive; there is also a...

Read more →

Driving mileage: 62 miles

Posted by Tony Brown on

Issue: The car's keyless entry function is invalid.  Diagnosis: The vehicle is new. When doing PDI, the maintenance professional discovered that the system had a fault code: “B117113 enters and starts the system antenna in the bumper is open, static," which was deleted after the fault code was removed. When testing the four-door keyless entry function, the door lock function was working, but on the second day, the customer reported the failure again.  After the technician picks up the car and turns on the ignition switch, the instrument displays "Fault: Keyless System". The fault code is still B117113.  The entry...

Read more →

Model: Discovery 4, V6 diesel engine 3.0L.

Posted by Tony Brown on

VIN: SALMN15486A××××××. Driving mileage: 33418 miles. Issue: The customer reported that the sunroof of the car could not be opened.  Diagnosis: The car was brought into the factory for routine repair. The sunroof could not be opened, according to the owner. The sunroof did not respond when the sunroof switch was operated after the vehicle key was switched on, according to the fault verification. The sunroof calibration with Land Rover's unique diagnostic device yields no results.  When connecting the diagnostic instrument to read the fault code, no associated fault code is found. The following are the main reasons for the...

Read more →

[Repair Case] Lexus ES350 smart boarding system fails

Posted by Tony Brown on

[Repair Case] Lexus ES350 smart boarding system fails

Issue: The Lexus ES350 sedan has 136,000 miles and is fitted with one-key smart start and smart boarding functions. Customers say they can't utilize the smart car system normally.  Diagnosis: Start the vehicle without using the smart key to approach the ignition switch, indicating that the smart entry system is not turned off (can be set to turn off), turn the vehicle power mode to OFF state, press the smart key to lock and unlock Switch, it is discovered that the vehicle can be unlocked and locked normally, without any abnormalities, the vehicle will be unlocked. The vehicle could be...

Read more →

[Repair Case] 2014 Audi A7 multiple fault lights suddenly light up while driving.

Posted by Tony Brown on

[Repair Case] 2014 Audi A7 multiple fault lights suddenly light up while driving.

Model: 2014 Audi A7 Coupe. Driving mileage: 37282miles.   Issue: Multiple fault lights suddenly light up during driving, with ABS, tire pressure monitoring and air suspension all illuminated. The fault remains after the car is turned off and restarted.   Diagnosis: First, connect to VCDS and enter 03 detection, the fault code is 0365 of the right front wheel speed sensor, the fault code is shown in Figure 1.   Figure 1 Turn the right front wheel once the wheel is off the ground, and the wheel speed as well as forward and backward status can be displayed normally in...

Read more →

[Repair Case] Audi Q3 tire pressure light is on

Posted by Tony Brown on

[Repair Case] Audi Q3 tire pressure light is on

  Model: CRH engine, 0BH transmission. Driving Mileage: 24,000 miles. Issue: The tire pressure light is on when the vehicle is driving. Diagnosis: the diagnostic instrument detects the vehicle fault code, ABS controller fault code: 01314 engine control unit, please read the fault code; engine control unit fault code: 00257 air quality sensor 1 signal is unreliable.  The circuit diagram of the air quality sensor G70 is shown in Figure 1.   Figure 1  SC15 powers the fuse for the air quality sensor, as shown in Figure 2.   Figure 2  Analysis of the cause of the failure:  Air quality...

Read more →

[Repair Case] 2012 Jeep Wrangler cold car shift delay

Posted by Tony Brown on

[Repair Case] 2012 Jeep Wrangler cold car shift delay

  Model: A 2012 Jeep Wrangler off-road vehicle equipped with a 3.6L engine and matches the 722.6 electronically controlled 5-speed automatic transmission produced by Mercedes-Benz. The mileage is about 170,000km.  Issue: Cold car shifting delay, 2-3 gears, 3-4 gears have a serious lag phenomenon, sometimes the second or third gear will be locked after a long driving time, and the transmission ratio error of the second or third gear will be reported when the gear is locked. The fault code of the valve has been replaced with a new valve body in the previous maintenance.  Diagnosis: P0732 and P0733 are...

Read more →

[Repair Case] 2016 Mercedes-Benz GLA200 remote key cannot be unlocked

Posted by Tony Brown on

[Repair Case] 2016 Mercedes-Benz GLA200 remote key cannot be unlocked

Model: 2016 Mercedes-Benz GLA200 (156.943), equipped with 270.910 engine and 724.001 transmission. Driving Mileage: 12,430 miles. Issue: The vehicle cannot be locked/unlocked using the remote-control key. Diagnosis: The customer reported that using the lock/unlock button on the remote-control key doesn’t lock/unlock the vehicle, and the same is true when using a different remote control key. However, the unlocking and locking switches in the car can be unlocked and locked normally. In this way, the hardware problem of the lock block can be quickly eliminated. But this car does have abnormal locking failures, so use a Mercedes-Benz special diagnostic instrument to...

Read more →