Hello everyone. I own a 2002 Discovery 2 SD edition with 117k miles. I am currently facing an issue with the three amigos on permanently and getting a P1590 code on every start up. I ordered an icarsoft LR2 and scanned for ABS codes and got the following:



0104 Pump failure 1 (monitor line)

0120 Pump failure 4 (pump running when not actuated)

0202 PWM signal failure from engine ECU

0820 Rear left sensor signal erratic

0B10 Shuttle valve switch electrical failure



Any insights on these codes? Anything that needs immediate attention? Everything seems to be running fine although I do get intermittent brake squealing but had them looked at and appears to be no issues. Thanks in advance!

 

Judging by the number of codes, I'd say the electrical component on the ABS module itself is bad. They're known for that. If not, then you have multiple seperate issues going on. Shuttle valves which are located on bottom side of ABS module and wheel sensor on rear left, not sure specifically what the other could be besides faulty ABS electronics or wiring somewhere along the way.

 

Look up the "Option B" fix on this forum. These things are well documented issues.