bm2amb

Hi,

I got a 2009 W204 C220 CDI diesel. There are two issues with it which started since Jan this year (2023)


1. On Jan 2023, I was driving at the highway (110km), the car will suddenly loose power and "ESP currently unavailable" will come up on the dash. the car will not rev over 1500 rpm, (limp mode ?). It clears only once you stop and switch it off and back on.


2. Since April, the car will loose drive for 1-2 seconds. Intermittently the car will just loose power - it can happen going fast or slow, car can be warm or cold.. it just cuts the power then after 1 or 2 seconds it goes fine, engine light went on for 24hrs, then disappeared. I took to the workshop, they changed the engine and fuel related relay, but it happens again after 4 weeks, because the fault is totally intermittent, the workshop has spend a lot of time to test, which caused a lot money on labor and did not the fix the problem


I bought a OBD reader, it happens again today. I have attached the DTC log, the workshop think its not the startup relay issue (because I always start may car without issues), also don't think its fuel regulator issue. I just don't want to spend lots of $$$ for someone spend half day to test and change out all the working parts and not resolve the issue.


anyone got similar experience ? Thanks


============================

OBD-IIOBD-II

DTCs: 9

----------------------------

P0615 [0x0615]

Starter motor relay - circuit malfunction

Status: Confirmed

----------------------------

P0091 [0x0091]

Fuel pressure regulator 1 - short to earth; Fuel Pressure Regulator 1 Control Circuit Low Voltage

Status: Confirmed

----------------------------

P0615(00) [0x061500] Archive (inactive)

Starter motor relay - circuit malfunction

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0597(00) [0x059700] Archive (inactive)

Thermostat heater control system - open circuit

Status: Confirmed, Test failed since last DTC clear

----------------------------

P2600(00) [0x260000] Archive (inactive)

Engine coolant pump motor - open circuit

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0091(00) [0x009100] Archive (inactive)

Fuel pressure regulator 1 - short to earth; Fuel Pressure Regulator 1 Control Circuit Low Voltage

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0244(13) [0x024413] Archive (inactive)

Turbocharger (TC) wastegate regulating valve A - range/performance problem

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0045(00) [0x004500] Archive (inactive)

Turbocharger (TC) boost control solenoid/supercharger (SC) boost control solenoid - open circuit

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0033(00) [0x003300] Archive (inactive)

Turbocharger (TC) bypass valve - circuit malfunction

Status: Confirmed, Test failed since last DTC clear

============================

Engine control unitEngine control unit

DTCs: 7

----------------------------

P0615(00) [0x061500] Archive (inactive)

Starter motor relay - circuit malfunction

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0597(00) [0x059700] Archive (inactive)

Thermostat heater control system - open circuit

Status: Confirmed, Test failed since last DTC clear

----------------------------

P2600(00) [0x260000] Archive (inactive)

Engine coolant pump motor - open circuit

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0091(00) [0x009100] Archive (inactive)

Fuel pressure regulator 1 - short to earth; Fuel Pressure Regulator 1 Control Circuit Low Voltage

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0244(13) [0x024413] Archive (inactive)

Turbocharger (TC) wastegate regulating valve A - range/performance problem

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0045(00) [0x004500] Archive (inactive)

Turbocharger (TC) boost control solenoid/supercharger (SC) boost control solenoid - open circuit

Status: Confirmed, Test failed since last DTC clear

----------------------------

P0033(00) [0x003300] Archive (inactive)

Turbocharger (TC) bypass valve - circuit malfunction

Status: Confirmed, Test failed since last DTC clear

============================

Transmission control unit

No DTC found.

============================

ABS control unitABS control unit

DTCs: 1

----------------------------

C2106 [0x6106] Archive (inactive)

Status: Validated and stored in non volatile memory

bm2amb

2019/Nov/13 New battery installed
2023/Jan/10 On the highway (110km), the car will suddenly loose power and "ESP currently unavailable" will come up on the dash. the car will not rev over 1500 rpm. However did not leave any DTC in the log
2023/Apr/09 Same thing happened again No EPS error this time, left DTC code: P0615 (Starter motor relay) and P0091 (Fuel pressure regulator 1)
2023/Apr/18 The car loose power in the car park, wouldn't crank up. after few mins it started again. (DTC same as OP)
2023/Apr/24 Workshop changed engine main relay, injection relay
2023/May/23 The car was suddenly shaked, and engine like came on. (DTC attached in OP)

It happened 4times in the past 5months, a bit more regular since Apr.

alynch

From your DTC log, only two faults are active; the starter relay and the fuel pressure regulator. I would concentrate on the second issue as this will directly affect the running condition of the vehicle. The code is reporting a fault to ground so I would first examine the wiring and any connectors associated with the regulator. Next, I would measure the fuel pressure. A drop in pressure would definitely cause the stumbling or the limp mode. I don't THINK the starter relay would interfere with the running of the running of the engine since it's only involved to start the engine.

bm2amb

Thanks for the reply

Would fuel regulator failed could create so many DTC electronics error ?

alynch

I don't think the DTCs are related. I would clear all the codes and drive for several weeks and then scan again for codes. This will give the ones which are still active and need attention.

bm2amb

it happened 4 times, basically same error codes (I kept the log), the main one are starter motor relay, fuel pressure regulator 1.

however I can start the car normally, with in 1 crank! battery is 3.5 years old Varta F21 AGM, cold idle voltage is 12.3

2023/Jan/10 On the highway (110km), the car will suddenly loose power and "ESP currently unavailable" will come up on the dash. the car will not rev over 1500 rpm. However did not leave any DTC in the log
2023/Apr/09 Same thing happened again No EPS error this time, left DTC code: P0615 (Starter motor relay) and P0091 (Fuel pressure regulator 1)
2023/Apr/18 The car loose power in the car park, wouldn't crank up. after few mins it started again. (Same DTC)
2023/Apr/24 Workshop changed engine main relay, injection relay
2023/May/23 The car was suddenly shaked, and engine like came on. (Same DTC)