Short answer. Yes. Under Article 1925, when two or more principals have granted a power of attorney for a common transaction, any one of them may revoke it without the consent of the others. So you do not need your co-principals' agreement — a single principal can withdraw the authority he joined in giving.
What the law says
When two or more principals have granted a power of attorney for a common transaction, any one of them may revoke the same without the consent of the others.
Civil Code, Article 1925 — Revocation by One of Several Principals. Read the full provision →
Any one principal can revoke
When several people together appoint one agent for a shared matter, each of them keeps the power to end the arrangement on his own. Article 1925 provides that when two or more principals have granted a power of attorney for a common transaction, any one of them may revoke the same without the consent of the others. So you do not have to persuade your co-principals or obtain their agreement — you can revoke the authority yourself. The revocation is not treated as a joint act requiring unanimity.
Why a single principal's revocation suffices
The rule reflects the nature of a power of attorney: it rests on the principal's trust and continues only so long as the principal wills it. That is true of each co-principal individually. Since each granted the authority freely, each must be free to withdraw it, without being held hostage to the others' choices. If unanimity were required to revoke, a principal who had lost confidence in the agent could be forced to keep him on until everyone agreed — which would defeat the very idea that agency is revocable at the principal's will.
What revoking on your own does — and does not do
It is worth being clear about the effect of a solo revocation. It ends the agent's authority to act for the principal who revoked; it does not, by itself, terminate the whole power as regards the others, whose grants stand until they too revoke or the matter is otherwise ended. So after one principal withdraws, the agent may no longer bind that principal, but the arrangement among the remaining principals is not automatically dissolved. Practically, this can complicate a common transaction — an agent authorised by some but not all of the original principals may not be able to complete a deal that needed all of them.
If you want out of a shared agency
If you joined others in giving one agent a power of attorney and you now want to withdraw, you can do so alone — you need no one else's consent. Communicate your revocation clearly to the agent, and, so it binds outsiders, make it known to those dealing with him and recover any document that shows his authority. Bear in mind that your revocation frees you but leaves the others' grants intact, which may stall a transaction that required everyone. If the common venture as a whole needs to end, the co-principals will each have to act; but for your own exit, your single revocation is enough.