Volvo C70 - Back End Losing Control! Sluggish Acceleration.
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Volvo C70 - Back End Losing Control! Sluggish Acceleration.
Hiya All (2006 Volvo C70 Convertible Manual)
I am looking for someone local that has VIDA so they can diagnose in W.Yorkshire (Dealers wanna charge £150!)
I purchased a Volvo C70 with a few gremlins and we are trying to figure out what could be the cause so i will list symptoms here if someone can offer guidance?
1. The backend sometimes loses it on any speed or gear.This is the one im scared about the most. Its happened a couple times.
2. EML keeps coming on and goes off.
3. Only once did i get an "anti skid service required" message.
4. The car is sluggish to accelerate and sluggish to reach speeds. This is regardless of how many times i switch it off or manually clear codes.
5. Water keeps getting to the roof motor even though drains were cleared.
The car has been well maintained except the roof motor was soaked in water so ive replaced that, but water is getting in somehow which we are working on.
The codes we found are
ECM-950C Ap position Sensor (Acceleration Pedal)
ECM 2600 Fuel Pressure Sensor
ECM 3400 Knock Sensor
Mechanic says it cant be all of that so its a wiring issue or some other issue.
According to research, it could be a YAW Sensor, a Steering Wheel Angle Sensor, an ABS fuse fault or ABS module replacement or a steering wheel module?
Im thinking to start with the inexpensive stuff to see if the car behaves? Whilst i find a local person that can read Vida codes at not so crazy prices...
(2006 Volvo C70 Convertible Manual)
I am looking for someone local that has VIDA so they can diagnose in W.Yorkshire (Dealers wanna charge £150!)
I purchased a Volvo C70 with a few gremlins and we are trying to figure out what could be the cause so i will list symptoms here if someone can offer guidance?
1. The backend sometimes loses it on any speed or gear.This is the one im scared about the most. Its happened a couple times.
2. EML keeps coming on and goes off.
3. Only once did i get an "anti skid service required" message.
4. The car is sluggish to accelerate and sluggish to reach speeds. This is regardless of how many times i switch it off or manually clear codes.
5. Water keeps getting to the roof motor even though drains were cleared.
The car has been well maintained except the roof motor was soaked in water so ive replaced that, but water is getting in somehow which we are working on.
The codes we found are
ECM-950C Ap position Sensor (Acceleration Pedal)
ECM 2600 Fuel Pressure Sensor
ECM 3400 Knock Sensor
Mechanic says it cant be all of that so its a wiring issue or some other issue.
According to research, it could be a YAW Sensor, a Steering Wheel Angle Sensor, an ABS fuse fault or ABS module replacement or a steering wheel module?
Im thinking to start with the inexpensive stuff to see if the car behaves? Whilst i find a local person that can read Vida codes at not so crazy prices...
(2006 Volvo C70 Convertible Manual)
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Joined: Jul 2020
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From: GA
The codes you posted are only OBD codes - have you scanned the entire car with a compatible scanner that can talk to all the control units?
(DON'T BUY ANY PARTS AND RANDOMLY REPLACE THEM YET!)
Lack of power could be related to the fuel pressure code. Fuel pressure sensors can go bad, but has the fuel pressure been checked? You can monitor the fuel pressure with a good scan tool and should be verified with a mechanical gauge. The EML light is the same as the check engine light here in the US. It means there is a self diagnostic code stored in the OBD system and that your car is polluting.
Last edited by hoonk; Mar 8, 2022 at 09:12 PM.
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Thanks Hoonk
So yes, when i turn the car, sometimes it loses control and the car spins out. I thought it might be because of the anti skid issue.
Suspension has been checked and all looks good. Tyres look good too and air pressure is checked each time i go out.
My mechanic believes due to the codes the car is possibly in some kind of limp mode hence the sluggish behaviour. Like, setting off in first foot down the pedal giving it all gas and it barely moves then after a short while it kicks in, as if the fuel finally delivered to the engine.
I am finding a mechanic with a VIDA DICE system so they can run diagnostics for me on the car. Hopefully this will give a better indication of the issue.
So yes, when i turn the car, sometimes it loses control and the car spins out. I thought it might be because of the anti skid issue.
Suspension has been checked and all looks good. Tyres look good too and air pressure is checked each time i go out.
My mechanic believes due to the codes the car is possibly in some kind of limp mode hence the sluggish behaviour. Like, setting off in first foot down the pedal giving it all gas and it barely moves then after a short while it kicks in, as if the fuel finally delivered to the engine.
I am finding a mechanic with a VIDA DICE system so they can run diagnostics for me on the car. Hopefully this will give a better indication of the issue.
What does "backend sometimes loses it" mean? Your lose control going around a turn and the car spins out, or tries to spin out like the rear end is over steering? What rear suspension bushing are worn out? Do you have any air in the rear tires?
The codes you posted are only OBD codes - have you scanned the entire car with a compatible scanner that can talk to all the control units?
(DON'T BUY ANY PARTS AND RANDOMLY REPLACE THEM YET!)
Lack of power could be related to the fuel pressure code. Fuel pressure sensors can go bad, but has the fuel pressure been checked? You can monitor the fuel pressure with a good scan tool and should be verified with a mechanical gauge. The EML light is the same as the check engine light here in the US. It means there is a self diagnostic code stored in the OBD system and that your car is polluting.
The codes you posted are only OBD codes - have you scanned the entire car with a compatible scanner that can talk to all the control units?
(DON'T BUY ANY PARTS AND RANDOMLY REPLACE THEM YET!)
Lack of power could be related to the fuel pressure code. Fuel pressure sensors can go bad, but has the fuel pressure been checked? You can monitor the fuel pressure with a good scan tool and should be verified with a mechanical gauge. The EML light is the same as the check engine light here in the US. It means there is a self diagnostic code stored in the OBD system and that your car is polluting.
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Joined: Jul 2020
Posts: 5,111
Likes: 675
From: GA
Oversteer can be caused by:
Tire pressure/tread differences
Rear sway bar too stiff or front bar disconnected/broken
Some c70's have problems with the rear upper control arms causing too much rear camber - what your rear camber?
"it could be a YAW Sensor, a Steering Wheel Angle Sensor, an ABS fuse fault or ABS module replacement or a steering wheel module?"
Your traction control/abs system is not going to lock up a wheel and cause you to spin out - What codes are stored in those control units, if any?
Tire pressure/tread differences
Rear sway bar too stiff or front bar disconnected/broken
Some c70's have problems with the rear upper control arms causing too much rear camber - what your rear camber?
"it could be a YAW Sensor, a Steering Wheel Angle Sensor, an ABS fuse fault or ABS module replacement or a steering wheel module?"
Your traction control/abs system is not going to lock up a wheel and cause you to spin out - What codes are stored in those control units, if any?
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Codes will be checked i think back end of next week now. No bookings yet.
I think tyre pressure may have been the cause....but it still doesnt explain the sluggish acceleration etc which seems to be attributed to some angle sensor, abs sensor or some other sensor.
Will wait for the codes to come through so it gives us a better idea i hope.
I think tyre pressure may have been the cause....but it still doesnt explain the sluggish acceleration etc which seems to be attributed to some angle sensor, abs sensor or some other sensor.
Will wait for the codes to come through so it gives us a better idea i hope.
Oversteer can be caused by:
Tire pressure/tread differences
Rear sway bar too stiff or front bar disconnected/broken
Some c70's have problems with the rear upper control arms causing too much rear camber - what your rear camber?
"it could be a YAW Sensor, a Steering Wheel Angle Sensor, an ABS fuse fault or ABS module replacement or a steering wheel module?"
Your traction control/abs system is not going to lock up a wheel and cause you to spin out - What codes are stored in those control units, if any?
Tire pressure/tread differences
Rear sway bar too stiff or front bar disconnected/broken
Some c70's have problems with the rear upper control arms causing too much rear camber - what your rear camber?
"it could be a YAW Sensor, a Steering Wheel Angle Sensor, an ABS fuse fault or ABS module replacement or a steering wheel module?"
Your traction control/abs system is not going to lock up a wheel and cause you to spin out - What codes are stored in those control units, if any?
Senior Member
Joined: Jul 2020
Posts: 5,111
Likes: 675
From: GA
Your original 3 obd codes. Knock sensor, gas pedal and fuel pressure.
Knock sensor won't cause lack of power, but a bad fuel pressure sensor (and that's a relatively common failure) or a problem with the gas pedal could cause lack of power.
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